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The working title of this film was Assignment in Berlin. Several reviews noted that the character of "Keith Wilson" was loosely modeled on William Joyce, the English Nazi propagandist known as "Lord Haw Haw," who broadcast into England from Germany, advocating British surrender. Unlike the film character, however, Joyce was not a spy. Although reviews and the CBCS list the Nazi brother and sister as the "Preissings," they are addressed in the film as the "Von Preissings." George Sanders was borrowed from Twentieth Century-Fox to appear in this picture. Sanders' father, Henry P. Sanders, plays "Sir Douglas Wilson," the father of Sanders' character "Keith Wilson" in the film.