Newly married couple Juliette and ship captain Jean struggle through marriage as they travel on the L'Atalante along with the captain's first mate and a cabin boy.

The itinerant musician Lampluche, having found a musical score on the banks of a river and a full wallet, was taken to the neighboring town for the famous composer Maxence Leroy. The inhabitants of the small town only dream of music, so Lampluche is very well received. But Maxence Leroy arrives in the city.

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.