A superbly creepy supernatural horror. Maitland (Peter Cushing) and Phillips (Christopher Lee) are keen researchers of witchcraft and always looking for interesting items to further their research. Marco (Peter Wymark) brings Maitland a book about the Marquis de Sade... bound in human skin. But that's not all... he also has the skull of the Marquis de Sade himself!
The skull once belonged to Phillips but was stolen from him... but he is not keen to get it back. He tells Maitland the skull is possessed by demonic forces. This doesn't put Maitland off but when he goes to Marco's to buy it he finds the man killed. When Matland has the skull she soon finds dark forces are also driving him... to kill his own wife (Jill Bennett)...
The film is tremendous fun, maybe verging on cheese at times especially when the skull flies around the room. Everything is saved by the great cast. The horror is mostly by suggestion instead of overt gore but that usually makes for a better horror film.