London 1929. When the Duc de Richleau (Christopher Lee) arrives with his friend Rex Van Ryn (Leon Greene) at the home of his protege Simon Aron (Patrick Mower) for a party he realises at once the young man is involved in devil worship and tries to extricate him from the clutches of the cult led by Mocata (Charles Gray). The other initiate Tanith (Nike Arrighi) is the medium through whom Mocata works and is essential to the plan to bring out the Devil at a ceremony on Salisbury Plain. In order to defend them, the Duc has to create a protective circle with his niece and her husband that involves Mocata conjuring the Angel of Death to draw out his influence and take the couple’s child as a channel for evil. Dennis Wheatley’s novel is brilliantly adapted by Richard Matheson, and the material as a whole is treated with the kind of seriousness which elevates it from melodrama into dramatic allegory, a duel between good and evil. This may be the best ever Hammer and the best film by director Terence Fisher. Lee is fabulous as the one strongwilled man capable of testing the forces of destruction while all around him is weakness, scepticism and naivete. So terrifying.