On a Greek island during the 1912 war, several people are trapped by quarantine for the plague. If that isn't enough worry, one of the people—a superstitious old peasant—suspects a young woman of being a vampiric demon.
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Boris Karloff as Gen. Nikolas Pherides
Ellen Drew as Thea
Marc Cramer as Oliver Davis
Katherine Emery as Mary St. Aubyn
Helene Thimig as Madame Kyra
Alan Napier as St. Aubyn
Jason Robards Sr. as Albrecht
Ernst Deutsch as Dr. Drossos
Skelton Knaggs as Andrew Robbins (uncredited)
Sherry Hall as Col. Kobestes (uncredited)
Erick Hanson as Officer (uncredited)
Rose Hobart as Mary St. Aubyn (in long shot; uncredited)