Occult novelist John Verney(Richard Widmark) is asked by his friend Harry Beddowes(Denholm Elliot) to look after his daughter Catherine whilst she's in London. What Verney does not know is that a group of Satanists lead by the excommunicated priest Father Michael(Christopher Lee) are desperate to get their hands on Catherine as she is required for a hideous ritual to bring the demon Azaroth back into the world. Soon Verney and his friends are fighting for their lives.
This film, Hammer's last feature length horror, is an excellent adaptation of Dennis Wheatley's novel. It is very tense and quite frightening in places, especially as the forces of evil do have the upper hand for most of the film. Richard Widmark as Verney is terrific, maybe an unlikely choice for many, but he is entirely credible as he begins to understand what a dangerous situation he finds himself in. Christopher Lee is gives a sinister, underplayed performance as the very dangerous Father Michael.
There are a couple of reasons that stop this film from being a classic, the hand puppet emmissary of evil, and a terribly rushed garish ending. Apart from those quibbles, its a very fine film, and it really is a shame that Hammer concentrated solely on television output after this.
A flawed classic. 4 out of 5