Actor Dana Andrews stated that location filming in Paris was interrupted by Communist agitators who were intent on preventing filming.
It is the last American film shot by Märta Torén, who later left the United States for Italy. The reasons for this departure are the accusations of communism on her husband, the screenwriter Leonardo Bercovici, her wish to raise her future child far from Hollywood and the weariness of not having been able to get better roles.
Dana Andrews and Märta Torén previously starred in another Cold War thriller, Sword in the Desert (1949).
Jeanne's car is a 1951 Ford Vedette convertible. It was designed by Ford in the U.S. with a body style similar to the Mercury, and was built in France by Ford SAF.