At the borders of the Saharan desert, the dramatic situation of a battalion of light infantry attacked by the enemy.

The workers Legendre and Martinet have won a large sum in the national lottery. Instead of squandering it, they had the good idea to invest it in industry. Happy in business, they soon find themselves at the head of a fortune. But their characters are very different. Legendre, who is brave and honest, narrowly escapes the malevolence of a couple of harlots. Martinet, his former work companion, has become a crooked and formidable financier. Both will face each other in court, the honesty of the first finally triumphing over the greed of the second.

Eusèbe Bonbonneau, a solicitor's clerk, learns one day that a candidate bearing his name runs for election as a member of parliament. In fact Frazier, a crooked businessman, has urged an accomplice to impersonate Eusèbe, in order to obtain, through this straw man, authorizations for the creation of a casino in Sanceau-les-Nains and to make big money out of it. Eusébe decides to go to Paris to investigate. In the capital he meets Mariska, an exuberant actress who encourages him to try to get elected. As a result, thanks to her the true Bonbonneau becomes a member of parliament and the crook's accomplice is arrested. But Frazier is not impressed and, changing tactics, he starts manipulating Eusèbe.

Dédé de Montmartre, former king of the accordion, has become a bad boy who lives off drug trafficking and prostitution. He sets his sights on a young girl, fresh and naive, Odette, saleswoman at Galeries Lafayette. But he is touched by the charm of this midinette.