Pierre Gilieth has committed a murder in Paris. He flees to Barcelona, where he runs out of money. So he joins the Spanish Foreign Legion. He meets there two fellow countrymen, Mulot and Lucas. He tries to forget his fault... but Lucas's friendship soon appears to be less unselfish...

A young settler from Algeria is in love with the boss's niece. Of course, the father of the young man is formally opposed to the marriage. But helped by his mother and by the kingpin himself, the boy achieves his goals.

A likeable young man, reduced to living by expediency, is launched in spite of himself into an adventure of stealing jewels. With the help of a brave, rough-looking but actually very clear-sighted policeman, the jewels are recovered, the stolen young woman is reassured and the main culprit is forced into exile.