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The title of this French bedroom farce translates to A Fly in the Ointment. That "fly" is music-hall performer Lucette (Suzy Delair), the current girlfriend of rakish roue Bois D'Enghien (Noel-Noel). Preparing to marry into a wealthy and honorable family, Boris is bedeviled by Lucette, who refuses to break up their relationship. Her tune changes abruptly when a handsome millionaire enters the picture. Adapted from the stage play by George Feydeau, Un Fil a La Patte is all slamming doors, bedroom tete-a-tetes, and lines like "But mon cherie, I can explain everything!"