Pierre is in Hamburg on a merchant ship with his friends Georges and Jean-Marie. While they are just looking for a good time in the twenty-four hours they have to waste in the city, Pierre is seized by the memory of a young German girl, Maria, whom he had known and probably loved when he was a prisoner of war in the bombed-out port of Hamburg. He abandons his companions in search of her, but is unable to trace her, her house having been destroyed and the search services having no record of her.

1957 film by Christian-Jaque

Naive and good-hearted Léon Ménard arrives in Paris, determined to find work in the capital. In a café, he meets Bob, a seedy guy, who helps him to get a job. On cloud nine, the ingenuous young man, does is unaware of how Bob manipulates him. Having become the night concierge of a hotel, the thankful Léon lets Bob and his accomplices get into the pace. Jewels are stolen as a result.When he is accused, Leon refuses to incriminate his "friend". Fortunately, Charlotte, Léon's fiancé, manages to find evidence of Bob's guilt and thanks to a premium paid by the diamond dealer the two lovebirds can buy a grocer's shop and tie the knot.

A propaganda film of the communist party of France, showing how the comrades help the proletariat against the capitalists.