Isle of the Dead (1945)

Gen. Nikolas Pherides (Boris Karloff) takes leave from the 1912 Balkan War to visit a small island in Greece, where his wife is buried. While there, a plague breaks out -- and along with an American reporter (Marc Cramer) and several other travelers, Pherides is forced to stay when quarantine is declared. Soon, locals and foreigners alike succumb to the influence of Madame Kyra (Helene Thimig), who accuses a nurse (Ellen Drew) of being a vampire and the true cause of the recent deaths.