Christopher Lee stars in this British horror directed by Peter Sykes. The film follows Michael Rayner (Lee), an excommunicated priest turned Satanist who places young girl Catherine Beddows (Nastassja Kinski) under his spell, hoping that she will bear a child that will be the offspring of Satan. However, when Catherine's father Henry (Denholm Elliott) asks occult novelist John Verney (Richard Widmark) for help, Verney springs into action and does all he can to take down the evil Rayner and get Catherine out alive.