One night per year, the government sanctions a 12-hour period in which citizens can commit any crime they wish -- including murder -- without fear of punishment or imprisonment. Leo, a sergeant who lost his son, plans a vigilante mission of revenge during the mayhem. However, instead of a death-dealing avenger, he becomes the unexpected protector of four innocent strangers who desperately need his help if they are to survive the night.

The police try to arrest expert hostage negotiator Danny Roman, who insists he's being framed for his partner's murder in what he believes is an elaborate conspiracy. Thinking there's evidence in the Internal Affairs offices that might clear him, he takes everyone in the office hostage and demands that another well-known negotiator be brought in to handle the situation and secretly investigate the conspiracy.

Given the country's overcrowded prisons, the U.S. government begins to allow 12-hour periods of time in which all illegal activity is legal. During one of these free-for-alls, a family must protect themselves from a home invasion.

Negotiator expert Cheuk Man Wai unexpectedly becomes the prime suspect in a murder case. Forced into a corner, he occupies the police station, taking officers hostage, and demands negotiations with the former negotiator Tse Ka Chun. With Tse's expertise in psychological manipulation and Check's exceptional skills, they engage in a battle of wits. As the verbal sparring deepens, their positions and mindsets gradually change.

Two years after choosing not to kill the man who killed his son, former police sergeant Leo Barnes has become head of security for Senator Charlene Roan, the front runner in the next Presidential election due to her vow to eliminate the Purge. On the night of what should be the final Purge, a betrayal from within the government forces Barnes and Roan out onto the street where they must fight to survive the night.

On New Year's Eve, inside a police station that's about to be closed for good, officer Jake Roenick must cobble together a force made up cops and criminals to save themselves from a mob looking to kill mobster Marion Bishop.

To push the crime rate below one percent for the rest of the year, the New Founding Fathers of America test a sociological theory that vents aggression for one night in one isolated community. But when the violence of oppressors meets the rage of the others, the contagion will explode from the trial-city borders and spread across the nation.

A troubled man starts working at a retirement home and realizes its residents and caretakers harbor sinister secrets. As he investigates the building and its forbidden fourth floor, he starts to uncover connections to his own past and upbringing as a foster child.