A heretic priest (the legendary Christopher Lee in one of his finest Hammer performances) plots to use a teenage nun (Nastassja Kinski) in a depraved sexual pact with the forces of darkness. But when an American occult novelist uncovers the conspiracy, he must battle an international cabal of evil for the body and soul of the Devil's child-bride. Can this black magic marriage be stopped before an innocent girl is defiled as the womb of Satan?