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Flower-shop owner Clo-Clo (Michel Simon) is known to his friends as "Jean de la Lune" ("Moondreaming John") because he fantasizes about remaking the world to his own specifications. Falling in love with Marceline (Madeline Renaud), a girl who's "been around," Clo-Clo idealizes his sweetheart, blinding himself to her many faults. At first, Marceline laughs at Clo-Clo behind his back but eventually is so touched by his wistful sincerity that she falls genuinely in love with him. Based on a play by Marcel Achard, Jean de la Lune is treated in a frank, realistic manner. This serves to make the happy ending, in which Clo-Clo's "moondreaming" comes true, all the more powerful.