宾夕法尼亚州一个宁静的小镇，恐怖袭击降临。灰石精神病院一名臭名昭著的囚犯越狱。他渴望复仇，展开了一场残酷的杀戮狂欢，让镇民陷入恐慌。

An orphaned teenager forms an unlikely friendship with a detective. Together they investigate her mother's murder, and uncover the supernatural force that proves to be a threat to her family.