一个大学女生参加姐妹会竞选，而她养了一只可爱的树懒，意识到可以让这只小动物担任姐妹会的吉祥物，对自己拉票也有利。但此后，姐妹会里发生了一系列死亡事件，树懒竟成为了第一嫌疑犯……该片变成了一个姐妹们与树懒斗争的逃生故事，但是，当然，树懒们跑得可不快。...

　　Follows a pair of siblings who love but distrust each other as they embark on a white-water rafting trip with a small group. One of their friends from childhood turns out to be more dangerous than h...