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 he appears.。影片讲四个同住一间宿舍的女大学生,都是学习表演的学生,她们的作业是学习一部名叫《双重不忠》的剧本,结果剧中情节对她们的真实生活产生奇妙的影响,尤其是她们如何处理爱情、性欲、信任、背叛、犯罪、艺术等人生课题。。