Upon moving to Beverly Hills, the Blacks are not given any time to settle in before they are told that the city's annual purge event is about to start. For twelve hours, nothing is illegal.
The movie of the Blacks, a family that inherited a million dollars and moves to Beverly Hills, leaving all their problems behind in Detroit. But as soon as they arrive, they find that the annual purge has started, the time when everyone can do everything that is illegal for 12 hours.