Marie, a 25-year old young woman, is found stabbed to death on the altar of a church. Gabriel Mangin, a young repeat offender, comes forth and admits to having murdered her. When questioned, Mangin expresses his profound affection for the victim. While the investigators search for a possible motive, the young man’s behavior completely changes. He is possessed by a demon who calls himself Belial and claims to have committed the murder. Chloe sees the incident as a sign of schizophrenia, but Rocher thinks it is Mangin’s strategy to avoid serving a mandatory prison …