The sinister Vincent Price invites his enemies to spend the night in his decaying, old, creepy mansion with a violent past. He offers them $10,000.00 each if they can spend an entire night in the house. He gives each one a tiny coffin with a gun enclosed, and then comes up with all sorts of devices to cause them to use the guns on each other. The real villains are Price's wife Olmart and her lover Marshall. A perennial favorite of horror fans.