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The working title of the film was Sabotage Agent, and some sources reviewed it under the title Tartu. Although the film is listed in Hollywood Reporter production charts as being shot from late September to mid-October 1943, the SAB form on the film, contained in an AMPAS Library file, indicates that the film was completed on January 10, 1943, and a modern source indicates that it was shot in July and August 1942. As the film was reviewed in Variety on August 4, 1943, it would seem unlikely that the Hollywood Reporter production chart dates are accurate. The film was released in England in late 1943 under the original working title, Sabotage Agent. That version of the film was five minutes longer than the American release and included one additional scene. The scene, which occurred just after the character "Tartu" is given his assignment, takes place in his mother's house, which has just sustained bomb damage.