Plot: In 1912, during the First Balkan War, the cruel, heartless and superstitious Greek General Nikolas Pherides rows a boat to a small island with the American Boston Star journalist Oliver Davis to visit his wife's grave. They find it destroyed and the body missing and they overhear a woman singing. Soon they learn that the archaeologist Albrecht lives in the island with his servant Madame Kyra and is welcoming his friends St. Aubyn, his wife Mrs. Mary St. Aubyn and their servant Thea; and Andrew Robbins. Albrecht invites General Pherides and Oliver to spend the night with them but during the night, Andrew dies. General Pherides summons Dr. Drossos that informs that Andrew died of pestilence and advises that they have to stay quarantined in the spot for the plague until the warm and dry Sirocco wind blows in the island. Otherwise it might happen an outbreak in the continent. The superstitious Kyra convinces General Pherides that Thea is the evil demon Vorvolaka and Mrs. St. Aubyn and Oliver need to protect her against the ignorance.
Alternative Plot: 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.
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