Dennis Wheatley's black magic novel gets the Hammer horror treatment, with Christopher Lee relishing the chance to play the good guy for once as the Duc De Richleau, an authority on the occult who does battle a group of Satanists (led by Charles Gray) for the soul of his friend. Made the same year as Rosemary's Baby, it was one of a number of films that brought Satan out of the shadows during the onset of the Summer of Love and is one of Hammer's best movies. Directed by the legendary Terence Fisher (The Curse of Frankenstein (1957), Dracula (1958), The Hound of the Baskervilles (1959) and The Mummy), from a screenplay written by Richard Matheson (of I Am Legend fame, the novel that spawned Last Man on Earth with Vincent Price, Omega Man with Charlston Heston and I Am Legend with Will Smith), it received praise from Wheatley himself and Christopher Lee said in interviews that it was one of his favorite onscreen performances. The cast includes Niké Arrighi as the sexy satanic neophyte Tanith Carlisle and Sarah Lawson and Leon Greene. The grinning Goat of Mendes in the film was played by Eddie Powell, who was Christopher Lee's stunt double in Hammer's 1958 adaptation of Dracula.