Plot: After Sir Karell Borotin is found dead in his study, drained of his blood, the local doctor determines that he was killed by a vampire. The coroner and police Inspector Neumann dismiss the suggestion but a year later, Sir Karell's daughter is attacked and bite marks are found on her throat. Neumann calls in the eminent Professor Zelin who thinks the story of vampires is true. The locals are convinced that Count Mora and his daughter Luna are the perpetrators of the crime, creatures of the night that can turn themselves into bats. There may be another solution however and the Professor sets a trap.
Alternative Plot: In a remote village in Central Europe, a nobleman's body is found drained of its blood and two punctures on his neck--the Mark of the Vampire. An ancient terror, a horror that won't die haunts the village: the long undead Count Mora (Bela Lugosi) and his daughter Luna (Carroll Borland), rule the night. But the vampires have not fed on the people of the village for a very long time. Now, with the help of an expert in the occult, Professor Zelen (Lionel Barrymore) and a local Baron (Jean Hersholt), police inspector Neumann (Lionel Atwill) unearth a mystery far stranger and more terrifying than anyone could have imagined!
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