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SOLUTIONS TO REVIEW QUESTIONS
AND EXERCISES
FOR PART 7 – OBJECT DBMSs (CHAPTERS 27 – 28)

Database Systems: Instructor’s Guide - Part III
2
Solutions to Review Questions and Exercises
Chapter 27 Object-Oriented DBMSs – Concepts and Design......................................................................... 3
Chapter 28 Object-Oriented DBMSs: Standards and Systems.......................................................................11

3
Chapter 27 Object-Oriented DBMSs – Concepts and Design
Review Questions
27.1 Describe the three generations of DBMSs.
First generation is the hierarchical and network DBMSs.
Second generation is the relational DBMSs.
Third generation is the object-oriented and object-relational DBMSs.
See Section 27.1.
27.2 Compare and contrast the different definitions of object-oriented data models.
Discussion of definitions provided in Section 27.2.1.
27.3 Describe the main modeling primitives of the functional data model.
The main modeling primitives are entities and functional relationships (see Section 27.2.2).
27.4 What is a persistent programming language and how does it differ from an OODBMS?
A language that provides its users with the ability to (transparently) preserve data across
successive executions of a program, and even allows such data to be used by different
programs (see Section 27.2.3). Main difference between PPL and OODBMS is that the
OODBMS tends to provide more DBMS-related services.
27.5 Discuss the difference between the two-level storage model used by conventional DBMSs and
the single-level storage model used by OODBMSs.
See Section 27.3.
27.6 How does this single-level storage model affect data access?
See Section 27.3.
27.7 Describe the main strategies that can be used to create persistent objects.
Checkpointing, serialization, and explicit paging. Explicit paging includes reachability-based and
allocation-based persistence (see Section 27.3.3).
27.8 What is pointer swizzling? Discuss the different approaches to pointer swizzling.
Action of converting OIDs to main memory pointers (See Section 27.3.1).

4
27.9 Describe the types of transaction protocol that can be useful in design applications.
See Sections 27.4.1 and 22.4.
27.10 Discuss why version management may be a useful facility for some applications.
There are many applications that need access to the previous state of an object. For example, the
development of a particular design is often an experimental and incremental process, the scope of
which changes with time. It is therefore necessary in databases that store designs to keep track of
the evolution of design objects and the changes made to a design by various transactions. See
Section 27.4.2.
27.11 Discuss why schema control may be a useful facility for some applications.
Engineering design is an incremental process and evolves with time. To support this process,
applications require considerable flexibility in dynamically defining and modifying the database
schema. For example, it should be possible to modify class definitions, the inheritance structure,
and specifications of attributes and methods without requiring system shutdown. See Section
27.4.3.
27.12 Describe the different architectures for an OODBMS.
See Section 27.4.4.
27.13 List the advantages and disadvantages of an OODBMS.
See Section 27.5.
27.14 Describe how relationships can be modelled in an OODBMS.
See the discussion on Section 27.6.2.
27.15 Describe the different modelling notations in the UML.
Expect discussion of the notations for:
• Structural diagrams, which describe the static relationships between components, and
include:
o class diagrams,
o object diagrams,
o component diagrams,
o deployment diagrams.
• Behavioral diagrams, which describe the dynamic relationships between components, and
include:
o use case diagrams,
o sequence diagrams,

5
o collaboration diagrams,
o statechart diagrams,
o activity diagrams.
Exercises
27.16 For the DreamHome case study documented in Appendix A, suggest attributes and methods
that would be appropriate for Branch, Staff, and PropertyForRent classes.
The attributes should be similar to those documented in the textbook. The student would be
expected to come up with standard get/set methods, such as GetStaffSalary, PutStaffSalary,
and then methods for registering new properties for rent, new owners, new clients,
appointments for viewings, and so on.
27.17 Produce use case diagrams and a set of associated sequence diagrams for the DreamHome case
study documented in Appendix A.
Students should use the “Data Transactions” sections of Appendix A to derive a list of use
cases. The diagrams should be similar to those seen in Figure 27.20 for use cases and 27.21
for sequence diagrams. In Section A.1 the actor is Branch User, and in Section A.2 the actor is
Staff User.
27.18 Produce use case diagrams and a set of associated sequence diagrams for the University
Accommodation Office case study documented in Appendix B.1.
Students should use the “Query Transactions” sections of Appendix B.1 to derive a list of use
for sequence diagrams. The actor is administrative user.
27.19 Produce use case diagrams and a set of associated sequence diagrams for the Easy Drive
School of Motoring case study documented in Appendix B.2.
Students should use the “Query Transactions” sections of Appendix B.2 to derive a list of use
for sequence diagrams. The actor is administrative user.
27.20 Produce use case diagrams and a set of associated sequence diagrams for the Wellmeadows
Hospital case study documented in Appendix B.3.
Students should use the “Transaction Requirements” sections of Appendix B.3 to derive a list
of use cases. The diagrams should be similar to those seen in Figure 27.20 for use cases and
27.21 for sequence diagrams. The actor is hospital worker.

6
27.21 You have been asked by the Managing Director of DreamHome to investigate and prepare a
report on the applicability of an OODBMS for your organization. The report should compare
the technology of the RDBMS with that of the OODBMS, and should address the advantages
and disadvantages of implementing an OODBMS within the organization, and any perceived
problem areas. Finally, the report should contain a fully justified set of conclusions on the
applicability of the OODBMS for DreamHome.
A well-presented report is expected. Justification must be given for any recommendations
made.
27.22 For the relational Hotel schema in the Exercises at the end of Chapter 4, suggest a number of
methods that would be applicable to the system. Produce an object-oriented schema for the
system.
Some methods might be:
createNewHotel destroyHotel changeHotelName
getHotelName
createNewRoom destroyRoom changeRoomPrice
changeRoomType getRoomPrice getRoomType
createNewGuest destroyGuest changeGuestName
changeGuestAddress getGuestName getGuestAddress
createNewBooking destroyBooking changeRoomNumber
changeDates getDateFrom getDateTo
Room
roomNo {PK}
hotelNo {PK}
type
price
createNewRoom
destroyRoom
changeRoomPrice
changeRoomType
getRoomPrice
getRoomType
1..*
Contains
1..1
1..*
Makes
1..1
Guest
guestNo {PK}
guestName
guestAddress
createNewGuest
destroyGuest
changeGuestName
changeGuestAddress
getGuestName
getGuestAddress
Hotel
hotelNo {PK}
hotelName
city
createNewHotel
destroyHotel
changeHotelName
getHotelName
Booking
hotelNo {PK}
guestNo {PK}
dateFrom {PK}
dateTo
roomNo
createNewBooking
destroyBooking
changeRoomNumber
changeDates
getDateFrom
getDateTo
Gets
1..1
1..*

7
27.23 For the relational Project schema in the Exercises at the end of Chapter 5, suggest a number of
system.
27.24 For the relational Library schema in the Exercises at the end of Chapter 5, suggest a number of
system.
27.25 Produce an object-oriented database design for the DreamHome case study documented in
Appendix A. State any assumptions necessary to support your design.
The student should produce a model similar to Figure 16.9 with some methods added. You
may prefer to get the student to do this particular exercise in two parts: one to produce an
object-oriented design for the Staff view and one for the Branch view.
27.26 Produce an object-oriented database design for the University Accommodation Office case study
presented in Appendix B.1. State any assumptions necessary to support your design.
The student should produce a model similar to that given in the solution to Exercise 16.16 with
some methods added.
27.27 Produce an object-oriented database design for the EasyDrive School of Motoring case study
presented in Appendix B.2. State any assumptions necessary to support your design.
some methods added.
27.28 Produce an object-oriented database design for the Wellmeadows Hospital case study presented
in Appendix B.3. State any assumptions necessary to support your design.
some methods added. Again, you may prefer to get the student to do this particular exercise based
on the particular views that have been identified (Charge Nurse, Director, and Personnel).

8
27.29 Repeat Exercises 27.22 to 27.28 but produce a schema using the functional data model.
Diagramatically illustrate each schema.
(a) Hotel case study.
RoomIn
Room
sex
city
hotelNo
Hotel
string
string
hotelName
string
guestAddress
guestName
string
guestNo
string
dateFrom
dateTo
date
date
Booking
MadeBy
Makes
city
hotelNo
string
hotelName
string
string
Contains
string
Guest
BookingFor
Gets

9
(b) University Accommodation Office case study
Sample solution as follows (only primary key shown):
Using the above two diagrams as exemplars and the solutions to Exercises 27.23 and 25.28,
should be relatively straightforward to create the diagrams for the remaining case studies.
ManagedBy Manages
InspectionFor
Has
IS-A
IS-A
Generates
Provides
GeneratedFor
LeaseFor
For
sex
leaseNo
string
placeNo
string
Lease
invoiceNo
string
Invoice
RoomIn
Accommodation Room
AttendedBy Attends
HasNOK
NOKFor
sex
courseNo
string
Course
matricNo
string
Student
Inspection
NOK
Requests RequestedBy
UndertakenBy
Undertakes
Hall
Staff
staffNo
string
Flat
hallNo
string
flatNo string

10
27.30 Using the rules for schema consistency given in Section 27.4.3 and the sample schema given
in Figure 27.11, consider each of the following modifications and state what the effect of the
change should be to the schema:
(a) adding an attribute to a class
(b) deleting and attribute from a class
(c) renaming and attribute
(d) Making a class S a superclass of a class C
(e) removing a class S from the list of superclasses of a class C
(f) creating a new class C
(g) deleting a class
(h) modifying class names.
See Section 27.4.3.

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11
Chapter 28 Object-Oriented DBMSs: Standards and Systems
Review Questions
28.1 Discuss the main concepts of the ODMG Object Model. Give an example to illustrate each of
the concepts.
The ODMG OM is a superset of the OMG OM and specifies the following basic modeling
primitives:
• The basic modeling primitives are the object and the literal. Only an object has a unique
identifier.
• Objects and literals can be categorized into types. All objects and literals of a given type
exhibit common behavior and state. A type is itself an object. An object is sometimes
referred to as an instance of its type.
• Behavior is defined by a set of operations that can be performed on or by the object.
Operations may have a list of typed input/output parameters and may return a typed
result.
• State is defined by the values an object carries for a set of properties. A property may be
either an attribute of the object or a relationship between the object and one or more
other objects. Typically, the values of an object’s properties can change over time.
• An ODMS stores objects, enabling them to be shared by multiple users and applications.
An ODMS is based on a schema that is defined in the Object Definition Language
(ODL), and contains instances of the types defined by its schema.
See Section 28.2.2.
28.2 What is the function of the ODMG Object Definition Language?
ODL is a language for defining the specifications of object types for ODMG-compliant
systems, equivalent to the Data Definition Language (DDL) of traditional DBMSs. Its main
objective is to facilitate portability of schemas between compliant systems while helping to
provide interoperability between ODMSs. The ODL defines the attributes and relationships of
types and specifies the signature of the operations, but it does not address the implementation
of signatures. The syntax of ODL extends the Interface Definition Language (IDL) of the
CORBA. The ODMG hope that the ODL will be the basis for integrating schemas from
multiple sources and applications. See Section 28.2.3.
28.3 What is the function of the ODMG Object Query Language?
ODMG OQL is used to specify how database objects are retrieved and manipulated within the
application program (see Section 28.2.4).

12
28.4 How does the ODMG GROUP BY clause differ from the SQL GROUP BY clause? Give an
example to illustrate your answer.
The OQL GROUP BY has been extended to provide an explicit reference to the collection of
objects within each group (which in OQL is called a partition). See Example 28.6.
28.5 How does the ODMG aggregate functions differ from the SQL aggregate functions? Give an
example to illustrate your answer.
The OQL aggregate functions can be applied within the select clause or to the result of the
select operation. For example, the following two expressions are equivalent in OQL:
SELECT COUNT(s) FROM s IN salesStaff WHERE s.WorksAt.branchNo = ‘B003’;
COUNT(SELECT s FROM s IN salesStaff WHERE s.WorksAt.branchNo = ‘B003’);
Note, OQL allows aggregate functions to be applied to any collection of the appropriate type
and , unlike, SQL, can be used in any part of the query. See Example 28.5.
28.6 What is the function of the ODMG Object Interchange Format?
The Object Interchange Format (OIF) is a specification language used to dump and load the
current state of an ODMS to and from one or more files. OIF can be used to exchange
persistent objects between ODMSs, seed data, provide documentation, and drive test suites.
See Section 28.2.5.
28.7 Briefly discuss how the ODMG C++ language binding works.
A C++ class library is provided containing classes and functions that implement the ODL
constructs. In addition, OML (Object Manipulation Language) is used to specify how database
objects are retrieved and manipulated within the application program. To create a working
application, the C++ ODL declarations are passed through a C++ ODL preprocessor, which
has the effect of generating a C++ header file containing the object database definition and
storing the ODMS meta-data in the database. The user’s C++ application, which contains
OML, is then compiled in the normal way along with the generated object database definition
C++ header file. Finally, the object code output by the compiler is linked with the ODMS
runtime library to produce the required executable image. See Section 28.2.5.
Exercises
28.8 Map the object-oriented design for the Hotel case study produced in Exercise 27.22 to the ODMG
ODL.
class Hotel {
(extent hotels key hotelNo)
attribute string hotelNo;
attribute string hotelName;

13
attribute string city;
relationship set<Room> Contains inverse Room::ContainedIn;
…
}
class Room {
(extent rooms key hotelNo, roomNo)
attribute string roomNo;
attribute string hotelName;
attribute string city;
relationship <Hotel> ContainedIn inverse Hotel::Contains;
relationship set<Booking> Gets inverse Booking::MadeFor;
changeRoomPrice(in roomNo:string, in float)raises(noSuchRoom);
changeRoomType(in roomNo:string, in char) raises(noSuchRoom);
…
}
class Guest {
(extent guests key guestNo)
attribute string guestNo;
attribute string guestName;
attribute string guestAddress;
relationship set<Booking> Makes inverse Booking::MadeFor;
…
}
class Booking {
(extent bookings key (hotelNo, guestNo, dateFrom))
attribute string guestNo;
attribute date dateFrom;
attribute date dateTo;
attribute string roomNo;
relationship <Room> MadeFor inverse Room::Gets;
relationship Guest MadeFor inverse Guest::Makes;
createNewBooking(in Hotel, in Guest, in Room)
raises(noSuchHotel, noSuchGuest, hotelFull)
changeRoomNumber();
changeDates();
…
}

14
Show how the following queries would be written in OQL:
(a) List all hotels.
hotel
or to sort them:
sort h IN Hotel by h.name
(b) List all single rooms with a price below £20.00 per night.
SELECT h.rooms
FROM h IN hotel
WHERE h.rooms.price < 20
(c) List the names and addresses of all guests.
SELECT STRUCT(name:g.name, address:g.address)
FROM g IN guest
(d) List the price and type of all rooms at the Grosvenor Hotel.
type prices {attribute price : float; type: char;}
prices (SELECT STRUCT(price:h.rooms.price, type:h.rooms.type)
FROM h IN hotel
WHERE h.name = ‘Grosvenor Hotel’
(e) List all guests currently staying at the Grosvenor Hotel.
SELECT g
FROM g IN guests
b IN g.booked_for
h IN b.booking_for
WHERE b.dateFrom <= ‘01-01-05’ AND
b.dateTo >= ‘01-01-05’ AND
h.name = ‘Grosvenor Hotel’
(substitute ‘01-01-05’ for today’s date).
(f) List the details of all rooms at the Grosvenor Hotel, including the name of the guest
staying in the room, if the room is occupied.
define occupied as
SELECT STRUCT(h.rooms,

15
SELECT g.name
FROM g IN guest
b IN g.booked_for
h IN b.booking_for
b.dateTo >= ‘01-01-15’ AND
h.name = ‘Grosvenor Hotel’)
FROM h IN hotel
UNION
SELECT STRUCT(h.rooms, nil)
FROM h IN hotel, y IN occupied
WHERE h.rooms.roomNo != y.roomNo
(g) List the guest details (guestNo, name and address) of all guests staying at the Grosvenor
Hotel.
SELECT STRUCT(guestNo:g.guestNo, name:g.name, address:g.address)
FROM g IN g IN guest
b IN g.booked_for
h IN b.booking_for
b.dateTo >= ‘01-01-15’ AND
h.name = ‘Grosvenor Hotel’
28.11 Map the object-oriented database design for the DreamHome case study produced in Exercise
27.25 to the ODMG ODL.
Partial solution as follows:
class Branch {
(extent branches key branchNo)
attribute string branchNo;
attribute struct BranchAddress {string street, string city, string postcode} address;
attribute list< string> telNo[3];
relationship set<Registration> Registers inverse Client::IsRegisteredWith;
relationship Staff Has inverse Staff::WorksIn;
relationship Manager IsManagedBy inverse Manager::Manages;
relationship set<PropertyForRent> Offers inverse PropertyForRent IsOfferedBy;
}

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different content

“‘Plan 3,’ that’s where they will hit us,” mused the Secret Service
Agent. “Is there a guard in the building?”
“Not inside, sir,” answered the orderly, “there’s a guard in front and
sentries around the barracks over in the square.”
“If I shouted, they could hear from this window, couldn’t they?”
asked Arrelsford.
“The guard in front could hear you, sir. But the time is getting short.
He must be nearly here, you’d better look out, sir.”
Edith Varney had heard enough of the conversation to understand
that Thorne was coming. Of course it would never do for him to see
her there.
“Where am I to go?” she asked.
“Outside here on the balcony,” said Arrelsford. “There is no closet in
the room and it is the only place. I will be with you in a moment.”
“But if he should come to the window?”
“We will step in at the other window. Stay, orderly, see if the window
of the Commissary General’s Office, the next room to the left, is
open.”
They waited while the orderly went out on the balcony and made his
inspection.
“The window of the next room is open, sir,” he reported.
“That’s all I want of you. Report back to Corporal Matson. Tell him to
get the body of the prisoner out of the Varney house. He knows
where it’s to go.”
“Very well, sir.”
“Mr. Foray,” continued Arrelsford, “whoever comes here you are to
keep on with your work and don’t give the slightest sign of my
presence to any one on any account. You understand?”
“Yes, sir,” said Foray from the telegraph table in the centre of the
room.

He had caught something of the conversation, but he was too good
a soldier to ask any questions, beside his business was with the
telegraph, not with Mr. Arrelsford.
“Now, Miss Varney,” said the Secret Service Agent, “this way, please.”
He opened the middle window. The girl stepped through, and he
was about to follow when he caught sight of a messenger entering
the room. Leaving the window, he retraced his steps.
“Where did you come from?” he said abruptly to the young man.
“War Department, sir.”
“Carrying despatches’?”
“Yes, sir.”
“You know me, don’t you?”
“I’ve seen you at the office, sir, and——”
“I’m here on Department business,” said Arrelsford. “All you have to
do is to keep quiet about it. Weren’t you stopped in the hall?”
“Yes, sir, but I had a despatch from the President that had to be
delivered to Lieutenant Foray.”
“Well, it is just as well,” said Arrelsford. “Don’t mention having seen
me to anybody under any pretext and stay here. You might be
needed. On second thoughts, Foray, let any messenger come in.”
With that Mr. Arrelsford stepped out onto the balcony through the
window which he closed after him, and he and Edith disappeared
from view.
“Messenger,” said Foray, “step down the hall and tell the private
there that by Mr. Arrelsford’s orders, messengers are allowed to
come up as they report.”
The room which had been the scene of these various colloquies
became silent save for the continuous clicking of the telegraph keys.
Presently two messengers came back and took their positions as
before.

Hard on their heels entered Captain Thorne. He was in uniform, of
course, and a paper was tucked in his belt. He walked rapidly down
the room, acknowledged the salutes of the messengers, and stopped
before the table. His quick scrutiny of the room as he advanced had
shown him that there was no one present except the messengers
and Lieutenant Foray. Foray glanced up, nodded, finished taking the
despatch which was on the wires at the time, wrote it out, put it in
its envelope, and then rose to his feet and saluted.
“Captain Thorne,” he said.
“Lieutenant Foray,” replied Thorne, taking the order from his belt and
handing it to the operator.
“Order from the Department?” asked Foray.
“I believe so,” answered Thorne briefly.
Lieutenant Foray opened it and read it.
“They want me to take a cipher despatch over to the President’s
house,” he said as he finished.
“Yes,” said Thorne, moving to the vacant place at the table. He
pulled the chair back a little, tossed his hat on the other table, and
otherwise made himself at home.
“I am ordered to stay here until you get back,” he began casually,
shoving the paper aside and stretching his hand toward the key.
“That’s an odd thing, Captain,” began Lieutenant Foray dubiously. “I
understood that the President was meeting with the Cabinet. In fact,
Lieutenant Allison went over there to take some code work a
moment ago. He must have gone home, I reckon.”
“Looks like it,” said Thorne quietly. “If he is not at home you had
better wait.”
“Yes,” said Foray, moving away, “I suppose I had better wait for him.
You will have to look out for Allison’s wire though on the other table.
He was called over to the Department.”

“Oh, Allison!” said Thorne carelessly. “Be gone long, do you think?”
he continued as he seated himself at the table and began to arrange
the papers.
“Well, you know how it is. They generally whip around quite a while
before they make up their minds what they want to do. I don’t
suppose they will trouble you much. It’s as quiet as a church down
the river. Good-night.”
“See here, Mr. Foray, wait a moment. You had better not walk out
and leave—no matter,” continued Thorne, as the operator stopped
and turned back. “It’s none of my business, still if you want some
good advice, that is a dangerous thing to do.”
“What is it, Captain?” asked Foray, somewhat surprised.
“Leave a cigar lying around an office like that. Somebody might walk
in any minute and take it away. I can’t watch your cigars all day.”
He picked up the cigar, and before Foray could prevent it, lighted it
and began to smoke. Foray laughed.
“Help yourself, Captain, and if there is any trouble you will find a
revolver on the table.”
“I see,” said Thorne, “but what makes you think there is going to be
trouble?”
“Oh, well there might be.”
“Been having a bad dream?” asked the Captain nonchalantly.
“No, but you never can tell. All sorts of things are liable to happen in
an office like this, and——.”
“That’s right,” said Thorne, puffing away at his cigar, “you never can
tell. But see here. If you never can tell when you are going to have
trouble you had better take that gun along with you. I have one of
my own.”
“Well,” said the operator, “if you have one of your own, I might as
well.”

He took the revolver up and tucked it in his belt. “Look out for
yourself, Captain. Good-bye. I will be back as soon as the President
gives me that despatch. That despatch I have just finished is for the
Commissary General’s Office, but it can wait until the morning.”
“All right,” said Thorne, and the next moment the operator turned
away while the clicking of the key called Thorne to the table. It took
him but a few minutes to write the brief message which he
addressed and turned to the first messenger, “Quartermaster
General.”
“He wasn’t in his office a short time ago, sir,” said the messenger.
“Very well, find him. He has probably gone home and he has to have
this message.”
“Very good, sir.”
The key kept up its clicking. In a short time another message was
written off.
“Ready here,” cried Thorne, looking at the other messenger. “This is
for the Secretary of the Treasury, marked private. Take it to his
home.”
“He was down at the Cabinet meeting a little while ago, sir,” said the
second messenger.
“No difference, take it to his house and wait until he comes.”
The instant the departing messenger left him alone in the room,
Thorne leaped to his feet and ran with cat-like swiftness to the door,
opened it, and quickly but carefully examined the corridor to make
sure that no one was there on duty. Then he closed the door and
turned to the nearest window, which he opened also, and looked out
on the balcony, which he saw was empty. He closed the window and
came back to the table, unbuckling his belt and coat as he came.
These he threw on the table. The coat fell back, and he glanced in
the breast pocket to see that a certain document was in sight and at
hand, where he could get it quickly. Then he took his revolver, which

he had previously slipped from his belt to his hip pocket, and laid it
down beside the instrument.
After a final glance around him to see that he was still alone and
unobserved, he seized the key on which he sounded a certain call.
An expert telegrapher would have recognised it, a dash, four dots in
rapid succession, then two dots together, and then two more
(—.... .. ..). He waited a few moments, and when no answer came
he signalled the call a second time, and after another longer wait he
sent it a third time.
After this effort he made a longer pause, and just as he had about
reached the end of his patience—he was in a fever of anxiety, for
upon what happened in the next moment the failure or the success
of the whole plan absolutely turned—the silent key clicked out an
answer, repeating the same signal which he himself had made. The
next moment he made a leap upon the key, but before he could
send a single letter steps were heard outside in the corridor.
Thorne released the key, leaned back in his chair, seized a match
from the little holder on the table and struck it, and when another
messenger entered he seemed to be lazily lighting his cigar. He
cursed in his heart at the inopportune arrival. Another uninterrupted
moment and he would have sent the order, but as usual he gave no
outward evidence of his extreme annoyance. The messenger came
rapidly down toward the table and handed Captain Thorne a
message.
“From the Secretary of War, Captain Thorne,” he said saluting, “and
he wants it to go out right away.”
“Here, here,” said Thorne, as the messenger turned away, “what’s all
this?” He ran his fingers through the envelope, tore it open, and
spread out the despatch. “Is that the Secretary’s signature?” he
asked.
The messenger came back.
“Yes, sir; I saw him sign it myself. I’m his personal messenger.”

“Oh!” said Thorne, spreading the despatch out on the table and
O.K.’ing it, “you saw him sign it yourself, did you?”
“Yes, sir.”
“Very well. We have to be pretty careful to-night,” he explained,
“there is something on. You are sure of this, are you?”
“I could swear to that signature anywhere, sir,” said the messenger.
“Very well,” said Thorne, “you may go.”

CHAPTER XIII
THE TABLES ARE TURNED
As soon as the door was closed behind the messenger Thorne laid
his cigar down on the table. Then he picked up the despatch from
the Secretary of War which the messenger had just brought in, and
folded it very dexterously. Then with a pair of scissors which he
found in a drawer he cut off the lower part of the Secretary’s
despatch containing his signature. He put this between his teeth and
tore the rest into pieces. He started to throw the pieces into the
waste basket but after a moment’s reflection he stuffed them into
his trouser pocket. Then he picked up his coat from the back of the
chair and took from the inside breast pocket another document
written on the same paper as that which had just come from the
Secretary of War. Spreading this out on the table he cut off the
signature and quickly pasted to it the piece of the real order bearing
the real signature. He carefully wiped this pasted despatch with his
handkerchief, making an exceedingly neat job of it.
As he did so, he smiled slightly. Fortune, which had dealt him so
many rebuffs had evened up matters a little by giving him this
opportunity. He had now in his possession a despatch bearing the
genuine signature of the Secretary of War. Even if he were
interrupted the chances were he would still be able to send it. So
soon as he had doctored the despatch, he sat down at the
instrument and once more essayed to send the message.
Now during all this rapid bit of manipulation Thorne had been under
close observation, for Arrelsford and Edith Varney had come from
the Commissary General’s Office, where they had concealed
themselves while Thorne examined the porch, and had stepped back
to the nearest window and were intently watching. Fortunately, his

back partially concealed his actions and the watchers could not tell
exactly what he had done, although it was quite evident that he was
in some way altering some kind of a despatch.
Just as Thorne began to send the message, Arrelsford accidentally
struck the window with his elbow, making a slight sound. The instant
he did so, he and the girl vanished from sight. Once again Thorne
released the key, and his hand moved quietly but rapidly from the
instrument to the revolver. The instant it was in his hand he sprang
to his feet, whirled about, leaped to the gas bracket and turned off
the light. The room was left in darkness, save for the faint
illumination of the moonlight through the windows.
Immediately he turned off the light he ran to the doors leading into
the hall. They were provided with heavy old-fashioned bolts which
he shot swiftly, locking them on the inside. Then with the utmost
caution he edged around the wall until he came to the first window.
He waited with his left hand on the catch of the window, and with
his right advanced his revolver. After a moment’s pause he threw it
open quickly and stepped out on the balcony. It was empty as
before.
He must have made a mistake, he thought, since no one was there,
and he blamed the whole incident to his over-agitated nerves.
Indeed what he had gone through in the preceding two hours would
have shaken any man’s nerves, might have broken most men’s. He
was annoyed at having wasted precious time, and turned to the
table again, stopping on his way to relight the light.
Once more he seized the key. He could telegraph equally well with
either hand. He did not lay down his revolver on the table this time,
but kept it in his right hand while the fingers of his left hand touched
the button. He had scarcely made a dot or a dash when there was a
sudden flash of light and the sound of an explosion, that of a heavy
revolver, mingled with the crash of shattered glass. Captain Thorne’s
fingers fell from the key and a jet of blood spurted out upon the
table and the papers.

He rose to his feet with incredible swiftness, his revolver in his right
hand, only to be confronted by Arrelsford at the front window. The
latter held in his hand, pointed fairly and squarely at Thorne, the
heavy service revolver with which he had just shot him in the left
wrist. Thorne made a swift motion with his right hand but Arrelsford
was too quick for him.
“Drop that gun!” he shouted. “Drop it quick, or you are a dead man!”
There was no possibility of disobedience. Thorne straightened up
and laid his revolver on the table. The two confronted each other,
and if looks could have killed they had both been dead men. The
soldier shrugged his shoulders at last, took his handkerchief out of
his pocket, put one end of it between his teeth, and with the other
hand wrapped it tightly around his wounded wrist.
The civilian meantime advanced toward him, keeping him covered all
the time with his revolver.
“Do you know why I didn’t kill you like the dog you are, just now?”
he asked truculently, as he drew nearer.
“Because you are such a damned bad shot, I suppose,” coolly
answered Thorne between his teeth, still tying the bandage, after
which he calmly picked up his cigar and began smoking again with
the utmost indifference.
Whatever fate had in store for him could better be met, he thought
swiftly at this juncture, provided he kept his temper, and so he spoke
as nonchalantly as before. Indeed his manner had always been most
irritating and exacerbating to Arrelsford.
“Maybe you will change your mind about that later on,” the latter
rejoined.
“Well, I hope so,” said Thorne, completing his bandage and tying the
knot so as to leave the fingers of his left hand free. “You see, it isn’t
pleasant to be riddled up this way.”
“Next time you’ll be riddled somewhere else beside the wrist. There’s
only one reason why you are not lying there now with a bullet

through your head.”
“Only one?” queried Thorne.
“Only one.”
“Do I hear it?”
“You do. I gave my word of honour to some one outside that I
wouldn’t kill you, and——”
“Oh, then this isn’t a little tête-à-tête just between ourselves. You
have some one with you?” asked Thorne, interested greatly in this
new development, wondering who the some one was who had
interfered in his behalf. Perhaps that evident friendship might be
turned to account later on. For a moment not an idea of who was
there entered Thorne’s mind.
“Yes, I have some one with me, Captain Thorne, who takes quite an
interest in what you are doing to-night,” returned Arrelsford
sneeringly.
“That is very kind, I am sure. Is the—er—gentleman going to stay
out there all alone on the balcony or shall I have the pleasure of
inviting him in here and having a charming little three-handed——”
The third party answered the question, for Edith Varney came
through the window with the shattered pane through which
Arrelsford had fired and entered. Thorne was shocked beyond
measure by her arrival, not the slightest suspicion that she could
have been there had crossed his mind. So she had been an eye
witness to his treachery. He had faced Arrelsford’s pistol with the
utmost composure, there was something in Edith Varney’s look that
cut him to the heart, yet she did not look at him either. On the
contrary, she carefully avoided his glance. Instead she turned to
Arrelsford.
“I think I will go, Mr. Arrelsford,” she said in a low, choked voice.
“Not yet, Miss Varney,” he said peremptorily.

The girl gave him no heed. She turned and walked blindly toward
the door.
“I don’t wish, to stay here any longer,” she faltered.
“One moment, please,” said Arrelsford, as she stopped, “we need
you.”
“For what?”
“As a witness.”
“You can send for me if you need me, I will be at home.”
“I am sorry,” said Arrelsford, again interposing, “I will have to detain
you until I turn him over to the guard. It won’t take long.”
The middle window was open and he stepped to it, still keeping an
eye on Thorne, and shouted at the top of his voice:
“Call the guard! Corporal of the Guard! Send up the guard to the
telegraph office!”
The note of triumph in his voice was unmistakable. From the street
the three inside heard a faint cry:
“What’s the matter? Who calls the guard?”
“Up here in the telegraph office,” said Arrelsford, “send them up
quick.”
The answer was evident sufficient, for they could hear the orders
and the tumult in the square below.
“Corporal of the Guard, Post Four! Fall in the guard! Fall in! Lively,
men!” and so on.
The game appeared to be up this time. Mr. Arrelsford held all the
winning cards, thought Thorne, and he was playing them skilfully. He
ground his teeth at the thought that another moment and the order
would have been sent probably beyond recall. Fate had played him a
scurvy trick, it had thwarted him at the last move, and Arrelsford
had so contrived that his treachery had been before the woman he
loved. Under other circumstances the wound in his wrist would have

given him exquisite pain, as it was he scarcely realised at the time
that he had been hurt.
Arrelsford still stood by the window, glancing out on the square but
keeping Thorne under close observation. The evil look in his eyes
and the malicious sneer on his lips well seconded the expression of
triumph in his face. He had the man he hated where he wanted him.
It was a splendid piece of work that he had performed, and in the
performance he sated his private vengeance and carried out his
public duty.
On his part, Thorne was absolutely helpless. There was that in the
bearing of the woman he loved that prevented him from
approaching her. He shot a mute look of appeal to her which she
received with marble face, apparently absolutely indifferent to his
presence, yet she was suffering scarcely less than he. In her anguish
she turned desperately to Arrelsford.
“I am not going to stay,” she said decisively, “I don’t wish to be a
witness.”
“Whatever your feelings may be, Miss Varney,” persisted Arrelsford,
“I can’t permit you to refuse.”
“If you won’t take me downstairs, I will find the way myself,”
returned the girl as if she had not heard.
She turned resolutely toward the door. Before she reached it the
heavy tramping of the guard was heard.
“Too late,” said Arrelsford triumphantly, “you can’t go now, the guard
is here.”
Edith could hear the approaching soldiers as well as anybody. The
way was barred, she realised instantly. Well, if she could not escape,
at least she could get out of sight. She turned and opened the
nearest window and stepped out. Arrelsford knew that she could not
go far, and that he could produce her whenever he wanted her. He
made no objection to her departure that way, therefore. Instead he
looked at Thorne.

“I have you just where I want you at last,” he said mockingly, as the
trampling feet came nearer. “You thought you were mighty smart,
but you will find that I can match your trick every time.”
Outside in the hall the men came to a sudden halt before the door.
One of them knocked loudly upon it.
“What’s the matter here?” cried the Sergeant of the Guard without.
The handle was tried and the door was shoved violently, but the
brass bolt held.
“Let us in!” he cried angrily.
Quick as a flash of lightning an idea came to Thorne.
“Sergeant!” he shouted in a powerful voice. “Sergeant of the Guard!”
“Sir!”
“Break down the door! Break it down with your musket butts!”
As the butts of the muskets pounded against the heavy mahogany
panels, Arrelsford cried out in great surprise:
“What did you say?”
In his astonishment, he did not notice a swift movement Thorne
made toward the door.
“You want them in, don’t you?” the soldier said, as he approached
the door. “It is locked and——”
But Arrelsford recovered himself a little and again presented his
revolver.
“Stand where you are,” he cried, but Thorne by this time had
reached the door.
“Smash it down, Sergeant!” he cried. “What are you waiting for!
Batter it down!”
The next moment the door gave way with a crash, and into the
room poured the guard. The grizzled old Sergeant had scarcely

stepped inside the room when Thorne shouted in tones of the
fiercest authority, pointing at Arrelsford:
“Arrest that man!”
Before the dazed Secret Service Agent could say a word or press the
trigger the soldiers were upon him.
“He got in here with a revolver,” continued Thorne more quietly, “and
is playing hell with it. Hold him fast!”

CHAPTER XIV
THE CALL OF THE KEY
This astonishing dénouement fairly paralysed Arrelsford. With a
daring and ability for which he had not given Thorne credit, and
which was totally unexpected, although what he had learned of his
previous career might have given him some warning, the tables had
been turned upon him by a man whom he confidently fancied he
had entrapped beyond possibility of escape!
His amazement held him speechless for a moment, but his natural
resourcefulness came back to him with his returning presence of
mind. He knew the futility of an attempt to struggle with his captors,
he therefore decided to try to reason with them.
“Sergeant,” he began, quietly enough, “my orders are——”
But Thorne would not let him continue. Having gained the
advantage he was determined to keep it to the end and for that
purpose he followed up his first blow, ruthlessly pressing his charge
hard.
“Damn your orders!” he interrupted furiously. “You haven’t got
orders to shoot up everybody you see in this office, have you?”
This was too much for Arrelsford, and he made a desperate plunge
forward to get at Thorne, who shook his wounded wrist in the Secret
Service Agent’s face. The soldiers held him tightly, however, and
Thorne continued hotly:
“Get his gun away, Sergeant; he’ll hurt somebody.”
While the soldiers—who appeared to entertain no doubt and to have
no hesitancy whatever about obeying Thorne’s orders, the latter
evidently the military man of the two and his voice and bearing, to

say nothing of his uniform, telling heavily against a civilian like
Arrelsford—were taking the revolver out of his hands, Thorne once
more turned to the telegraph table. His blood was up and he would
send the despatch now before the whole assemblage, before the
Confederate Government or its Army, if necessary.
Arrelsford burst out in a last vain attempt to stop him:
“Listen to me, Sergeant,” he pleaded desperately, “he is going to
send out a false telegram and——”
“That’ll do,” gruffly said the Sergeant of the Guard, shaking his fist in
Arrelsford’s face, “what is it all about, Captain!”
“All about? I haven’t the slightest idea. He says he comes from some
office or other. I was sending off some important official despatches
here and he began by letting off his gun at me. Crazy lunatic, I
think.”
“It’s a lie!” said Arrelsford furiously. “Let me speak—I will—prove
——”
“Here!” said the Sergeant of the Guard, “that’ll do now. What shall I
do with him, Captain?”
“I don’t care a damn what you do with him. Get him out of here,
that’s all I want.”
“Very well, sir. Are you much hurt?”
“Oh, no. He did up one hand, but I can get along with the other all
right,” said Thorne, sitting down at the table and seizing the key.
“Stop him!” cried Arrelsford, fully divining that Thorne intended to
send the message. “He’s sending a—wait!” A thought came to him.
“Ask Miss Varney, she saw him,—ask Miss Varney.”
But the old Sergeant of the Guard paid no attention whatever to his
frantic appeals.
“Here, fall in there!” he said. “We’ll get him out, Captain. Have you
got him, men? Forward then!”

Struggling furiously the squad of soldiers forced Arrelsford to the
door. Thorne paid absolutely no attention to them; he had forgotten
their presence. Like his attention, his mind and heart were on the
key again. But he was fated to meet with still another interruption.
“Halt there!” cried a sharp voice from the hall, just as the group
reached the door.
“Halt! Left Face!” cried the Sergeant in turn, recognising that here
was a superior whom it were well to obey without question or
hesitation.
“Here is General Randolph,” said the voice outside, giving the name
of one of the high officers of the Richmond Garrison.
“Present arms!” cried the Sergeant of the Guard as General
Randolph appeared in the doorway.
Following him were some officers of his staff and by his side was the
imposing figure of Miss Caroline Mitford. The humiliation and
indignation had vanished from her bearing which was one of
unmitigated triumph. She threw a glance at Arrelsford which bode ill
for that young man. The General entered the room and stopped
before the Secret Service Agent, who stood in front of the guard,
although he had been released by the men.
“What’s all this about?” he asked peremptorily.
Although he knew that something important was transpiring, and
that the newcomer was a man of rank, Thorne never turned his
head. At whatever cost, he realised he must get the telegram off,
and from the look of things it appeared that his only chance was
then and there. He did not care if the President of the Confederate
States of America were there in person, his mind and soul were on
the order. He was frantically calling the station he wanted, the one
indicated by “Plan 3,” and he had the doctored despatch, to which
he had pasted the Secretary’s signature spread out on the table
before him.

“What’s all this about refusing to send out Miss Mitford’s telegram!”
began General Randolph peremptorily. “Some of your work, I
understand, Mr. Arrelsford.”
“General!” cried Arrelsford breathlessly. “They have arrested me. It is
a conspiracy——” He turned toward Thorne. “Stop that man, for
God’s sake stop him before it’s too late!”
At this juncture, Caroline Mitford turned from the room and joined
old Martha in the hall, and disappeared. She had only come back
with the General to punish Arrelsford, but she did not care to have
her precious despatch made the subject of discussion before so
many people.
“Stop him!” exclaimed the General. “What do you mean?”
It was evident that the despatch was not to go out then. Thorne had
not succeeded in getting an answer to his signal. He left the key,
rose, and saluted.
“He means me, sir,” he said. “He’s got an idea some despatch I’m
sending out is a trick of the Yankees.”
“It is a conspiracy!” cried Arrelsford. “He is an impostor——”
“Why, the man must have gone crazy, General,” said Thorne coolly,
holding his position by the table and listening with all his ears for the
return signal.
“I came here on a case for——” expostulated Arrelsford.
“Wait!” said General Randolph. “I will soon get at the bottom of this.
What was he doing when you came in, Sergeant?” he asked of the
non-commissioned officer in charge of the guard.
“He was firing on the Captain, sir,” answered the Sergeant saluting.
“He was sending out a false order to weaken our lines at Cemetery
Hill, and I—ah—Miss Varney, she was here. She saw it all,” explained
Arrelsford.
“Miss Varney!” exclaimed the General.

“Yes, sir.”
“The General’s daughter?”
“Yes, sir.”
“And what was she doing here?”
“She came to see for herself whether this man was guilty or not;
whether he was a spy or a traitor.”
“Is this some personal matter of yours, Mr. Arrelsford?” asked the
General suspiciously.
“He was a visitor at her house and I wanted her to know.”
“Where is she now? Where is Miss Varney?” asked Randolph
impatiently.
“She must be out there on the balcony,” answered Arrelsford. “I beg
you to send for her, sir.”
“Sergeant,” said General Randolph, “step out on the balcony. Present
my compliments to Miss Varney, and ask her to come in at once.”
In a moment the Sergeant returned.
“There is no one there, sir,” he replied saluting.
At that instant Thorne got the long desired signal. Without a
moment’s hesitation, he turned to the key. He picked up the
despatch with his wounded left hand and with the other began to
manipulate the sounder.
“She must be there,” said Arrelsford, “or else she’s stepped into the
next room, the Commissary General’s Office, the window was open,
tell him to—ah!” as the sound of the clicking caught his ear, “Stop
him! He is sending it now!”
Mr. Arrelsford’s distress was so overwhelming and so genuine that
something of the man’s suspicion was communicated to the General.
“One moment, Captain,” he said.

Captain Thorne, of course, had no option but to release the key. He
stopped sending and dropped the despatch, saluting.
“Now, Mr. Arrelsford,” said the General, “what have you to do with
the Military Telegraph Department?”
“This is a Secret Service case; they assigned it to me, sir.”
“What is a Secret Service case?”
“The whole plot to send the order. It’s the Yankee Secret Service. He
is a member of it and his brother brought in the signal to-night.”
“I beg your pardon, sir,” said Thorne, “this despatch ought to go out
at once, sir. It came from the Secretary of War and it is very urgent.”
“Go ahead with it,” said General Randolph.
Thorne needed no further permission than that, dropped to his seat,
and once more seized the fatal key.
“No, no!” cried Arrelsford. “Don’t let him—I tell you it’s a——”
“Silence, sir,” thundered Randolph.
“Do you know what he is telling them?” persisted Arrelsford.
“No, do you?”
“Yes,” returned the Secret Service Agent.
“Wait a moment, Captain Thorne,” said the General, impressed in
spite of himself by this man’s earnestness, which made him
disregard all orders, commands, and everything else. “Where is the
despatch?”
Captain Thorne picked up the paper and handed it to the General,
and then stepped back. He had played his last card. He played it
desperately, boldly, and well.
“Well?” asked the General, looking from the despatch to the accuser,
“what has he been telling them?”
“He began to give an order to withdraw Marston’s Division from its
present position,” said Arrelsford, making a brilliant and successful

guess at the probable point of attack in “Plan 3.”
“That is perfectly correct,” said General Randolph, looking at the
paper.
“Yes, by that despatch, but that despatch is a forgery. It is an order
to withdraw a whole division from a vital point. A false order, he
wrote it himself. This is the turning point of the whole plot.”
“But why should he write it himself? If he wanted to send a false
order, he could send it without putting it down on paper, couldn’t
he?”
“Yes,” admitted Arrelsford, but he went on with great acuteness, “if
any of the operators came back they would catch him doing it. With
that order and the Secretary’s signature he could go right on. He
could even order one of them to send it.”
“And pray how did he get the Secretary’s signature to a forged
telegram?” asked General Randolph.
“He tore it off a genuine despatch. Why, General, look at that
despatch in your hand yourself. The Secretary’s signature is pasted
on, I saw him do it.”
“They often come that way, sir,” said Thorne nonchalantly.
“He is a liar!” cried Arrelsford. “They never do!”
Thorne stepped forward impulsively, his face flushed at the word
“liar,” but he controlled himself.
“General,” he said, “if you have any doubt about that despatch, send
it back to the War Office and have it verified.”
It was a splendid, magnificent bluff. So overwhelming in its
assurance that even Arrelsford himself was petrified with
astonishment. He was morally certain that Thorne was a Federal
Secret Service Agent and that the despatch was a forgery, yet it
would take but a few minutes to send it over to the Secretary’s office
and convict him out of his own mouth. What could the man mean!

“That’s a good idea,” said General Randolph. He hesitated a moment
and then turned to the guard. “Sergeant,” he said, “take this
despatch over to the Secretary’s office and——”
At that moment, the key which had been silent began a lively
clicking. General Randolph turned toward it, and Thorne made a
quick step in the same direction.
“What’s that?” asked the General.
Thorne stood by the desk listening while the key clicked out the
message.
“Adjutant General Chesney,” he spelt out slowly.
“Oh, from the front, then?” said Randolph.
“Yes, sir,” answered Thorne.
“What is he saying!”
Thorne stepped to the table and bent over the clicking key. “His
compliments, sir,” he read off slowly. “He asks”—waiting for a few
minutes—“for the rest,”—still another pause—“of that despatch—he
says it’s of vital importance, sir, and——”
The communication which Thorne had made to General Randolph
was in itself of vital importance. The General was too good a soldier
not to know the danger of delay in the carrying out of a military
manœuvre which was probably part of some general plan of attack
or defence to which he was not privy. He made up his mind instantly.
He took the despatch from the hand of the Sergeant and turned it
over to Thorne again.
“Let him have it,” he said decisively.
The Captain with his heart pounding like mad sat down at the table
and seized the key. Was he going to complete the despatch? Was
the plan to be carried out? Had he triumphed in the bold and
desperately played game by his splendid courage, resourcefulness,
and assurance? His eyes shone, the colour came back into his pale
cheeks as his hands trembled on the key.

“General!” cried Arrelsford, “if you——”
“That’s enough, sir. We will have you examined at headquarters.”
At that instant Lieutenant Foray came rapidly into the room.
“Thank God!” cried Arrelsford, as he caught sight of him. “There’s a
witness, he was sent away on a forged order, ask him?”
Another interruption, thought Thorne, desperately fingering the
keys. If they would only give him a minute more he could complete
the order, but he was not to have that minute apparently.
“Wait, Captain,” said General Randolph quickly, and again the key
was silent. “Now, sir,” he said to Lieutenant Foray, “where did you
come from!”
The Lieutenant did not all comprehend what was toward, but his
answer to that question was plain.
“There was some mistake, sir,” he answered, saluting.
“Ah!” cried Arrelsford, a note of triumph in his voice.
“Who made it?” asked the General.
“I got an order to go to the President’s house,” returned Foray, “and
when I got there the President——”
Thorne made one last attempt to complete his message.
“Beg pardon, General, this delay will be most disastrous. Permit me
to go on with this message. If there’s any mistake, we can rectify it
afterward.”
He seized the key and continued sending the message as he spoke.
“No!” cried Arrelsford.
General Randolph either did not hear Thorne’s speech or heed it, or
else he did not care to prevent him, and he continued his
questioning.
“Where did you get this mistaken order?” he asked.

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