The Devil Rides Out is a 1934 novel by Dennis Wheatley telling a disturbing story of black magic and the occult. The four main characters, the Duc de Richleau, Rex van Ryn, Simon Aaron and Richard Eaton, appear in a series of novels by Wheatley. The book was made into a film by Hammer Film Productions in 1968. There is also an abridged, young adult version "retold" by Alison Sage for the "Fleshcreepers" series (1987).