In an attempt to cope with her sister's death, Sarah joins a sorority. However, as her new sisters begin to manipulate her, she becomes trapped in their devious plans and has to fight to maintain her innocence.

当五个朋友在一个偏远的湖畔度假时，他们期待着一个不错的时光，不知道地球正在遭受外星人入侵和大规模绑架。