Genial, bumbling Monsieur Hulot loves his top-floor apartment in a grimy corner of the city, and cannot fathom why his sister's family has moved to the suburbs. Their house is an ultra-modern nightmare, which Hulot only visits for the sake of stealing away his rambunctious young nephew. Hulot's sister, however, wants to win him over to her new way of life, and conspires to set him up with a wife and job.
At the end of the 19th century, during a ball in Joinville, on the outskirts of Paris, Georges, a former delinquent working as a carpenter, meets Marie, a young woman connected to a criminal gang.
In the absence of his wife, a clarinet player is induced by a friend to meet a call girl, but arrived after a crime. Perceived by some people leaving the scene of the crime covered by his raincoat, he became the only suspect for the police. His only hope is to discover the murderer before is name is mentionned publicly, specially in front of his wife.
