This document provides a user guide for Darktrace's Threat Visualizer 6.1. It outlines workflows for investigating alerts from Cyber AI Analyst incidents and model breaches. It introduces the main components of the Threat Visualizer interface, including the workspace, threat tray, device event logs, and investigation tools. It also provides guidance on triaging and analyzing potential threats using the Dynamic Threat Dashboard, 3D network visualization, and event playback features.