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An American engineer in Istanbul, Howard Graham (Joseph Cotten), becomes the target of a Nazi assassination due to his involvement in improving the Turkish navy. With the help of police Colonel Haki (Orson Welles), Graham escapes from his hotel to board a ship to safety, leaving behind his wife (Ruth Warrick). On board, he encounters a number of passengers, including the dancer Josette Martel (Dolores del Río). However, the passenger Peter Banat (Jack Moss) is not who he appears to be. Wikipedia