AKA 'The Devil's Bride' - 1968
Starring Christopher Lee and Charles Gray
Screenplay by Richard Matheson (of I am Legend, The Legend of Hell House and Somewhere in Time fame)

Based on the novel by Dennis Wheatley, the man who popularized black magic in the late 1960's, this is a recommendation from Johnny Caples. It is reportedly Christopher Lee's favorite Hammer Horror film as it features the actor playing the hero rather than the villain he had become typecast as. A healthy dose of devil worship, arcane books and demonic possession make this one a must watch on your seasonal hit list!

Just look at the trailer!

Thanks, John!