Synopsis: In a mountaintop castle, devil worshippers hunt down virgins and cut out their hearts to restore life to their Great Mistress Isabella (Rita Calderoni), a witch who was burned to death centuries before. The castle is purchased by the unwitting Jack Nelson (Mickey Hargitay, former husband of Jayne Mansfield), whose niece Laureen (also played by Rita Calderoni) bears a striking resemblance to Mistress Isabella. Drawn into the cult's evil orbit, Laureen is targeted as the final sacrifice in order to restore Isabella's terrifying power.