A well-to-do family lives a lovely, carefree life until 13-year-old Cora starts to get violent nightmares which lands her in the hospital. Top-rated Radiologist, Nina Evanko, reviews Cora's files and suggests she stays with the family over a few nights to watch Cora as she sleeps. Nina soon realizes that there is something more mysterious, more vile in Cora's behavior than what science can explain. She turns to a Priest to conduct an exorcism but has the evil inside Cora become too strong?