Another superior Hammer film, based on the book by Dennis Wheatley.
Christopher Lee, as the Duc De Richlaeu, sets out to stop Mocata (Charles Gray - Blofeld in 'Diamonds are Forever') and his cult from summoning up the Devil.
As with 'Night of the Demon', the build-up to the sensational climax is almost unbearable. The finale includes giant spiders, dopplegangers - and Death itself.
Terence Fisher directs with his usual inspired style, while Richard ('The Night Stalker') Matheson converts Wheatley's book into a superb script. Truely one of Hammer's best.