In her final year at school, Anthropology student Lorraine decides to film her final project - the subject of exorcism within the Catholic Church. Recording interviews with priests from the local diocese, she stumbles upon Fr. Byrne, an older priest who is currently helping a young mother whose daughter is apparently possessed by a demonic force. The curiosity of Lorraine, along with her camera operator, Cathal, leads them down a dark path of discovering the terrifying truth, and things go from strange to worse as all involved become entangled into a frightful journey to save a little girl's life.