James Caan and Katherine Ross, a beautiful young couple with too much money and too much free time on their hands, amuse themselves with ghoulish fun and games in their Manhattan brownstone filled with mod and pop objets d'art--each of which is actually a mechanical contrivance destined in the course of the film to become an accessory to murder. When enigmatic cosmetics saleswoman Simone Signoret comes to their door, she is invited to stay and teach them some new games from her considerably more sophisticated bag of tricks. Scene by scene the games become less funny, until the skin begins to crawl. Masks are stripped away until we think there can be no more masks...but there is always one more mask in Curtis Harrington's horror world.