Simon and Tanith have survived, and Mocata's spell to conjure the Angel of Death has been reflected back on him. When the Duc and his companions awaken, they discover that the spell has reversed time and changed the future in their favour. She then leads Peggy in the recitation of a spell which visits divine retribution upon the cultists and transforms their coven room into a church. Suddenly, a powerful force (or Tanith herself) controls Marie and ends Peggy's trance. De Richleau, Richard, and Rex also try to rescue her, but they are defeated by Mocata.

Simon tries to rescue Peggy on his own, but he is recaptured by the cult.

The Duc has Tanith's spirit possess Marie in order to find Mocata, but they only are able to get a single clue, and Rex realizes that the cultists are at a house he visited earlier. His attacks defeated, Mocata kidnaps the Eatons' young daughter Peggy (Rosalyn Landor). De Richleau repels the angel, but it kills Tanith instead (as, once summoned, it must take a life). After visiting the house while de Richleau is absent to discuss the matter and an unsuccessful attempt to influence the initiates to return, Mocata forces de Richleau and the other occupants to defend themselves through a night of black magic attacks, ending with the conjuring of the Angel of Death. They are followed by the group's leader, Mocata (Charles Gray), who has a psychic connection to the two initiates. They escape to the country home of de Richleau's niece Marie (Sarah Lawson) and her husband Richard Eaton (Paul Eddington). During the rescue, they disrupt a May Day ceremony on Salisbury Plain, in which the Devil appears under the guise of the 'Goat of Mendes'. De Richleau and his friend Rex Van Ryn (Leon Greene) manage to rescue Simon and another young initiate, Tanith (Niké Arrighi), from a devil-worshipping cult. He quickly deduces that Simon is involved with the occult. Set in London and the south of England in 1929, the story finds erudite Nicholas, Duc de Richleau (Christopher Lee), investigating the strange actions of his protegé, the son of a late friend, Simon Aron (Patrick Mower), who has a house replete with strange markings and a pentagram. to become Warner Bros.-Seven Arts on July 15, 1967. It is the final film to be produced by Seven Arts Productions after the company was merged with Warner Bros. It is considered one of Terence Fisher's best films. The film stars Christopher Lee, Charles Gray, Niké Arrighi and Leon Greene. It was written by Richard Matheson and directed by Terence Fisher. The Devil Rides Out, known as The Devil's Bride in the United States, is a 1968 British horror film, based on the 1934 novel of the same name by Dennis Wheatley.

Book the devil rides out