When a young girl in the village of Durward is found emaciated, drained of all youth, Dr Marcus summons former comrade-in-arms Captain Kronos, who arrives with hunchbacked assistant Professor Grost in tow. Cast out from her clan for dancing on a Sunday, gypsy Carla has hitched a ride with the pair, whom she discovers to be vampire hunters.<br> <br>Vampires exist in many forms, and a spate of attacks indicates that Durward is cursed by such a presence. Marcus, meanwhile, has cause to suspect that the rich Durward family are involved. At their grand estate, he questions heirs Paul and Sara. Their bed-bound mother blames Marcus for the death of her husband Lord Hagen, a plague victim. The doctor is later assaulted by the mystery vampire.<br> <br>Upon his instructions, Kronos and Grost experiment on Marcus to find the one method that will negate this particular vampiric strain. Successful, his friend destroyed, Kronos devises a plan to expose the fiend -- by using Carla, now his lover, as bait...