Russian beauty Anita Mellikovna, traveling by train with a forged passport and carrying jewels, finds the police on her tail. Seeing Deene Maxwell, whom she met one summer in Scotland, on a train across the tracks, Anita climbs out of her train and enters his compartment. Deene, a British official traveling to Moscow, suggests they pose as husband and wife, since he has diplomatic immunity, and offers to marry her at the British Embassy. After the wedding, Anita reveals that she is already married to an eccentric, violent composer, Louis Capristi, whom she left on their wedding night after he threatened her. Meanwhile, Capristi, under the name Charles Pringle, is imprisoned in an English asylum for the criminally insane since he strangled a woman to death. Anita and Deene are happily in love in England when they are confronted by Capristi, who escaped after he heard about their marriage.