Review of The Devil's Nightmare (1971) by Greg S — 26 Mar 2011

Seven stranded tourists, each representing a deadly sin, spend a night at a castle where they are killed or corrupted by a succubus. The seven deadly sins angle is intriguing, but the movie itself is slow and dull; after a perverse introduction, it takes an hour of additional setup before anything starts to happen.

It's a "serious" horror movie with some interesting imagery and atmosphere and a creepy Devil, but not enough virtues to overcome the ponderous script.