Life is good in the port of Marseille but Titin is accused of murder!! ... His girlfriend is very unhappy and does not know what to do to prove her innocence .

The sentimental and comic adventures of three sailors, during a stopover of their ship in Toulon, are grafted onto a story of stolen documents, which allows the three friends to turn into amateur detectives.

Cabissol, the Mayor of Martigues, a town in the South of France, wishes to organize a bullfight as part of the coming festivities. But that is not counting on Escopette, an opponent of bullfighting, who kidnaps the bulls. What further complicates things is that the appointed bullfighter, Chico de Granada, takes the French leave with Violette, one of Cabissol's daughters. As a measure of retaliation, Cabissol decides to force Escopette to replace Chico in the arena. Fortunately, Rémy, the head herdsman, comes to his rescue. Finally, everything goes well and Cabissol is so happy that he gives Rémy the hand of Marguerite, his other daughter.

They are three fishermen from the Old Port: Toinet, Pénible and Girelle. Two of them are in love with two pretty merchants. Not confident in their natural seduction, they decide to use drastic measures to be sure to attract and sustain the attention of these young ladies. This is how they approach them by posing as wealthy industrialists. But now the young girls, not to be outdone, present themselves as film actresses.

In Paris, at the Foire du Trône, the showman Titin from Martigues spins the perfect love with the pretty Yvette, which arouses the jealousy of his rival Dix-de-Der who will cause his downfall. Without this affecting his Provençal joviality, Titin will try his hand at various odd jobs without ceasing to push the song.

Everything you wanted to know about your favorite circus, radio and movie stars. They tell you about their lives and likes and dislikes.

A song editor from Marseille meets the daughter of a showman whom a competitor wants to ruin to get the hand of the young woman.

In Marseilles, the fisherman Tonin closely monitors the actions of the wreckage workers led by a certain Mr. Léon. Could these bizarre individuals have something to do with the double murder at the Grand Hotel?

Because the shiner Titin has fallen in love with a singer, he braves the latter's protector, the baron, and passes himself off as an insurer in connection with a pearl necklace that is circulating. Bitters get involved, Titin kidnaps the beauty and leaves the pearls to the baron.