In post-war Europe, a diverse group of passengers aboard a U.S. Army train to bombed-out Frankfurt becomes involved in a Nazi assassination plot.

Two newlyweds spy on the Nazis for the British Secret Service during their honeymoon in Europe.

Frenchwoman Michele de la Becque, an opponent of the Nazis in German-occupied Paris, hides a downed American flyer, Pat Talbot, and attempts to get him safely out of the country.