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The opening title cards read, "Robert L. Lippert presents Cesar Romero, George Brent, Audrey Totter in Rupert Hughes' F.B.I. Girl." No additional information about Hughes's story has been found, and it is possible that it was an original screen story.
The film opens with a voice-over narration describing the United States Federal Bureau of Investigation as the symbol of international strength and hope, where criminal files are the responsibility of "nice, normal boys and girls" who could be susceptible to criminal influence. A June 5, 1951 Hollywood Reporter news item adds Gene Evans to the cast, but his appearance in the final film has not been confirmed.