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Gitta Alper is cast as Mme. Marguerite Savini, a celebrated Hungarian opera star. Her romance with British intelligence officer Richard Carter (John Loder) leads to dire consequences, forcing her into an espionage plot against the British government. The villain of the piece is Mme. Savini's husband Galloni (Nils Asther), who blackmails her into making a phonograph record containing a secret code message. The melodrama is never permitted to impede upon the musical highlights, which include an operatic medley performed early in the proceedings by star Gitta Alper. Based on a novel by Hans Rehfisch, Guilty Melody was simultaneously filmed in a French-language version, Disque 413