Théodore Beudraves works at night in a hotel and sleeps during the day. His salary allows him (unbeknownst to his wife Rose) to pay for singing lessons to Gaby Beauchamp, his young friend. But she falls in love with her son, Darius Beudraves, and vice versa.
In the studio where the famous director Eric Von Berg reigns, Pierre Vanier, the male star of the film and the lover of Berg's muse, dies while rehearsing a scene. Over the course of a tangled investigation, the culprit is unmasked. This honest dresser is the adoptive mother of Vanier's wife, too...
The farmer Remy has just invented a new fertilizer and spies are trying to seize his documents, taking him for the famous Remy, inventor of a device of interest to national defence.
A slapstick comedy centered on two neighboring republics, Crogandia and Miremia, and the various disasters that befall the ceremonial unveiling of a statue, the launching of a ship, and the crash-landing of a Miremian pilot in Crogandian territory.
