A group of would-be beneficiaries gather for the reading of a will, and discover that they must spend the night in a spooky castle to gain their inheritance. A spooky housekeeper and a man who seems to be a vampire are just two of the obstacles that might deter them.
A band of outlaws appear out of nowhere on a ranchers property and viciously shoot him down. They steal what they can from his ranch and kidnap his wife. They make for the Mexican border, but something starts stalking them.
Santo must battle an evil witch and the demons and evil spirits she brings up from Hell.