When a nature photographer explains to the Police how she fought her way out of the Watchatoomy Valley, they dismiss her crazed and violent story as a meth-induced nightmare. But when they discover that she's telling the truth, it's too late.

哈莉和新男友在他乡间庄园共度万圣节长周末时，一群蒙面怪人闯入，强迫他们玩一场邪恶游戏。令入侵者们大吃一惊的是，哈莉过往的硬汉经历让她掌握了一招绝技，最终让游戏以意想不到的方式结束。