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Sir Karell Borotyn (Holmes Herbert) is found murdered in his own house, with two tiny pinpoint wounds on his neck. The attending doctor Dr. Doskil (Donald Meek) and Sir Karell's friend Baron Otto (Jean Hersholt) are convinced that responsible for the murder is a vampire, specifically Count Mora (Bela Lugosi) and his daughter Luna (Carroll Borland), while the Prague police inspector (Lionel Atwill) refuses to believe. Now his daughter Irena (Elizabeth Allan) is the count’s next target. Enter Professor Zelen (Lionel Barrymore), an expert on vampires and the occult, who’s sent in to prevent her death. At the same time, secrets are revealed surrounding the circumstances of Sir Karell’s death.