Terence Fisher directs this British Hammer horror starring Anton Diffring and Christopher Lee. In Paris during the 1890s, sculptor Dr. Georges Bonnet (Diffring) cheats death by murdering a young woman once every ten years and taking her parathyroid glands for himself. But at 104-years-old, his long-time collaborator declines to help Georges with his next transplant, forcing him to blackmail another surgeon (Lee) to help him with latest target Janine Dubois (Hazel Court). But both the artist and the scientist are enamoured by the attractive young woman...