Mark of the Vampire is Tod Browning's remake of his own 1927 thriller London After Midnight, which unfortunately no longer exists. The sudden appearance of ghostly vampires in a remote mittel-European community is seemingly tied in with an old, unsolved murder case. Police inspector Neumann (Lionel Atwill) and occult expert Prof. Zelen (Lionel Barrymore) investigate, with the full cooperation of leading citizen Baron Otto (Jean Hersholt). For awhile, it looks as though the vampires -- Count Mora (Bela Lugosi) and his chalky-faced daughter Luna (Carroll Borland) -- will continue to hold the community in thrall, but the truth behind their mysterious activities is revealed midway through the film, whereupon the story concentrates on identifying the well-concealed murderer. In the original London After Midnight, Lon Chaney played both Count Mora and Prof. Zelen, which should provide a clue as to the film's incredible outcome.