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The film opens with the following written foreword: "Austria!...First of the unfortunate countries to fall under the heel of Nazi tyranny. A people subjugated and forced to do the work and bidding of a conqueror. Vienna, 1942." Although an April 1942 Hollywood Reporter news item announced that Universal had purchased the film rights to an anonymous book called The Strange Death of Hitler in February 1942, all other sources state that the film is based on an original story by Fritz Kortner and Joe May.
According to Hollywood Reporter, May was originally assigned by Universal to direct the film, but quit the project as production began due to a disagreement with the studio over the film's budget; he was replaced by James Hogan. The extent of May's directorial contribution to the released film has not been determined. A Hollywood Reporter news item includes opera singer Frank O. Lynn in the cast, but his appearance in the final film has not been confirmed. The Hollywood Reporter review made note of the "unbilled" performance of "Robert O. Davis," unaware that the actor had recently changed his name to Rudolph Anders.