When Countess Elizabeth Bathory (Ingrid Pitt) discovers that bathing in the blood of virgin girls will keep her eternally young and beautiful, she devises a master plan. She kidnaps her daughter, Ilona (Lesley-Anne Down), and takes over her persona. Then she goes to bed with a handsome young man, not caring about the mounting jealousy of her servant and lover, Capt. Dobi (Nigel Green). But Bathory's plan goes awry when she runs out of blood and begins to change back into her former self.