After several mysterious accidents, A Live Action Role Playing game is interrupted and the players leave the bunker while the staff remains behind to investigate the disappearance of Greg, the mastermind of the game.

阿尔卑斯山脚下的小镇上，大雾引发了一场交通事故，失事司机就是前来调查少女失踪案的警探沃格尔（托尼·塞尔维洛 饰），中学老师马提尼（阿莱西奥·博尼 饰）是他锁定的嫌犯。在心理医生弗洛里斯（让·雷诺 饰演）的疏导下，沃格尔缓缓…