All the rules are broken as a sect of lawless marauders decides that the annual Purge does not stop at daybreak and instead should never end.

America's third political party, the New Founding Fathers of America, comes to power and conducts an experiment: no laws for 12 hours on Staten Island. No one has to stay on the island, but $5,000 is given to anyone who does.

Former Police Sergeant Barnes becomes head of security for Senator Charlie Roan, a Presidential candidate targeted for death on Purge night due to her vow to eliminate the Purge.

A wealthy family is held hostage for harboring the target of a murderous syndicate during the Purge, a 12-hour period in which any and all crime is legal.

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.