Having recently moved into her new apartment, Irène Cazenave, the widow of a well-known police officer, is forced by one of her husband's colleagues to take part in an investigation. The building's provocative concierge has been found murdered. We watch a parade of suspects, only to learn at the end that Irène killed the janitor under blackmail. She kills herself.
Having lost his physician's license, Dr. Louis Krantz joins a gang of hoods to treat their wounded. When his son falls ill and needs expensive medical help, Louis decides to participate in a hold-up with the gang. Unfortunately for them, the robbery goes wrong. The gang boss, persuaded that Louis has betrayed them, decides to gun him down.
This is the the sad story of a car manufacturer, short of the readies, who asks his wife for money (for she owns the fortune). She refuses for her dad bankrupted himself and she would not be able to stand poverty again. He contemplates suicide but someone comes to his rescue and there's still hope: they can win the "Circuit De Minuit", a motor race. Besides, there's a another woman who cares for him.
