In the near future of the United States, the national unemployment rate is only 1%, the crime rate has hit an all-time low, and violence has almost disappeared. The United States of America seems to have entered a beautiful golden age like heaven, and this perfect appearance is made possible by an unprecedented sweep plan. In order to effectively release the depression and dissatisfaction in the hearts of citizens, the country has specially stipulated that a national sweep lasting twelve hours will be held after 7 pm one day every year. At that time, people will take to the streets and fight and kill without any legal responsibility. In this deformed era, security system salesman James Sandin (voiced by Ethan Hawke) made a fortune and lived a happy life with his wife and children. Another sweep night is coming, and the Sandin family sits in a luxurious mansion that is as solid as a rock, watching the performance of the night of killing on the screen. Who knows that this night, James' son Charlie rescued a homeless man who was being hunted, and the Sandin family was inevitably caught in a bloody vortex...