November the 1st. Year 2027. In all the USA it's the day of the annual social experiment instituted by the new Founding Fathers, called "the Purge": 12 interminable hours in which every crime, including murder, will become legal, and in which all the services of emergency will be unavailable. But this year in particular, there will be a novelty, which includes 4 students as cavy in every American college ... In Washington, a girl named Alex and 3 other students will be chosen to take part in this ... "experiment in the experiment" ... Will they overcome it?