The trailer provides glimpses of the wealthy suburban family at the center of the film as they prepare to barricade themselves inside their home for the annual Purge event. Shots show them arming doors and monitoring security cameras as violence erupts outside. Tension mounts as a stranger seeks refuge at their door and masked intruders threaten the family's safety. Through its use of lighting, editing, and sound, the trailer builds a sense of dread and chaos to draw viewers into the film's story of survival on one night when all crime is legalized.