影片改编自亚伦·斯塔姆同名小说，布莱恩·达菲尔德([拿起枪的简]编剧)自编自导。故事讲述女孩玛拉的同学无任何征兆性地突然发生人体爆炸身亡，玛拉的生活陷入了一片混乱。

A woman that must battle a demon from her past that has possessed her sister. Unfortunately, every priest trained in exorcisms has already died in a terrorist attack.