Devil's Nightmare

A group of tourists becomes stranded at a historic German castle, where they are stalked and killed by a succubus named Lisa Müller (Erika Blanc). Each tourist represents one of the Seven Deadly Sins, and Lisa uses their own weaknesses against them in deadly ways. The only one who seems immune to her charms is a seminarian, Alvin Sorelle (Jean Servais), who eventually makes a deal with Satan to save his companions' souls.