When innocent people are attacked by entities from the supernatural realm, they rely on paranormal investigators to protect them from the unknown. These investigators rely on their studies, their personal experiences and, in many cases, their piety, as they assume the risk of becoming haunted themselves.
Mary Vogel has been a spiritual counselor for ten years, but a recent encounter with the demonic forces her to question everything she knows and trusts. Violent nightmares invade her mind by day and unseen entities attack her body by night. In the church, which was once a place of peace and comfort, feelings of revulsion overwhelm her. Deep in her own mind, a diabolical voice taunts her: Your God can't help you now‚
John Zaffis, one of the world's leading paranormal experts and Mary's mentor, quickly realizes what is happening to her. The protector has become the possessed, and only an exorcism can save her soul.