Clodo, a gentle mongrel dog, isn't having much luck. His shaggy appearance has earned him the name of hobo. Often scolded by his Parisian masters for being a nuisance, his only consolation is Cathy, his youngest daughter. Unfortunately, she can't stop her parents from abandoning Clodo at vacation time. Fabien, a young farmer, takes the dog in, despite the hostility of his family. Fabien is secretly in love with his childhood friend, Arlène, "la demoiselle du château", who has left to study in Paris. But she returns home after a disappointment. Their relationship resumes.

Inspector Dubois investigates burglaries carried out by the Barbus gang. He tracks down the criminals and shoots some of them dead, before discovering that one of them is his brother.

A filmmaker finds his brother who he has not seen for ten years and introduces him to the world of African musicians in Paris.