Plot: An express train from Paris to occupied postwar Germany holds French, American, German, British, and Russian passengers, some of whom are not quite what they seem. A political assassination en route threatens an important conference, and beautiful Frenchwoman Lucienne recruits four fellow passengers of different nationalities to help find a missing man. As time runs out, the five must comb the shadowy ruins of bombed-out Frankfurt, with few clues to help them...
Alternative Plot: During World War II, passengers of various nationalities travel by train from France to Berlin. One of them, Dr. Bernhardt (Paul Lukas), is an influential peacemaker who wants to mend the war-torn continent. When Nazi conspirators determined to keep Bernhardt quiet set off an explosion on the train, it kills a man who turns out to be Bernhardt's decoy. Other passengers (Merle Oberon, Robert Ryan, Robert Coote) seek the doctor for an explanation, but deception is all around.
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