Every Sunday afternoon Mary, the beautiful, studious daughter of Bishop Quarcoopome is seized by a terrifying and unexplained frenzy. It is as if she has been possessed by the devil. Can the cause be found and Mary be cured? The young psychiatrist who is called in to help her is determined to find a way, for he finds his interest in her more than just professional. The help of the Church, traditional priests and modern medicine are all invokes in a desperate bid to save Mary’s life.