万圣节前一天，五名狂欢节员工被绑架挟持到一个称为“肃杀世界”的孤立院子。在万圣节时，他们会被扔进一个名叫“31”的虐待狂的游戏中，他们将面对一群穿得像小丑一样的疯子。然而，小丑并不是唯一需要担心的，一个更宏大的邪教仪式和更残酷的阴谋将被唤醒......The day before Halloween, five carnival employees are kidnapped & held hostage in an isolated compound known as "Murderworld". On Halloween, they are thrown into a sadistic game called "31" where they must survive 12 hours against a gang of maniacs dressed like clowns. It's time to play 31.