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Its title translates as Record 413, but Disque 413 is actually the French-language version of the British Guilty Melody. Singing star Gitta Alper repeats her role as opera diva La Salvini, who falls in love with British intelligence agent Richard Maury (Jules Berry, replacing the English version's John Loder). She is confronted by her despicable husband (Larquery), who threatens to ruin her career unless La Salvini does his bidding. He forces her to make a phonograph record containing a secret code message intended for the Enemy. For a while, the British secret service think that our heroine is a musical Mata Hari, but all is set right in the final moments. Both Guilty Melody and Disque 13 are based on a novel by Hans Rehfisch.