 The Hammond family has been cursed since the Crusades, with family members dying or committing suicide under mysterious circumstances.When two people, including Oliver Hammond (John Howard), are attacked by an unknown creature, a Scotland Yard scientist, Robert Curtis (James Ellison), and his sidekick Christy (Heather Thatcher) are dispatched to investigate.Although the local townspeople are convinced that the attacks are the result of the Hammond family curse, Curtis seeks a more scientific explanation.