Rosa darling, it's nothing against you, but you see, the two of us don't work much. So we're going to find you a wonderful lady who will take care of you. It's going to go well, you'll see.

“Each of you is an ambassador, and we are sure that each of you will be the best ambassador of our country.” This is how the film begins; a speech to emigrant workers for France. Salah left his three sisters and his mother to become an ambassador, going to work on a Defense site, wading in the mud, he works with a jackhammer. Salah wanders in search of work and housing. Coming up against racism from the owners claiming the respectability of the building and the good neighborhood, he finds himself in a hotel in the Goutte d'Or district. The body of Mehdi, friend of Salah, was found in the Canal Saint-Martin, murdered by a fascist commando, and Ali died of a bullet, killed by a racist janitor. Faced with crimes that remain unpunished, Salah and his friends organize, unite with the French working class to defend their lives and their right to work.

Valentin D is a hot designer architect who claims to be an orphan because he is too ashamed to admit he is the son of working-class scrap metal merchants from the north of France.

1957. For several months, Henri Charlègue, the ex-director of the newspaper "Alger democratic", banned, has been living in hiding. Suspected of belonging to the FLN, he is actively sought by paratroopers.