In Bordeaux, Inspector Baroni is investigating the death of a woman, Ms. Morlaix, who fell through the window of her apartment after an argument with her husband.
When Myriam, the mother of two young children, decides, despite the reluctance of her husband to resume her activity in a law firm, the couple is looking for a nanny. After a severe casting, they hire Louise, who quickly conquers the affection of children and gradually occupies a central place in the home. Gradually the trap of mutual dependence will close, until the tragedy.
A police officer who while responding to a violent hostage call, kills the African American suspect only to later learn of his innocence. Sensing this was a set-up, and facing repercussions, he must track down the person responsible while examining his own accountability and the ingrained racism which brought him to this point.
Louis Bertain is the owner of a Paris garage which is the front for a robbery gang. He and his accomplices are careful to keep up a civic veneer by day, indulging in criminal activities only when "the red light is on" at night. This status quo is upset when one of the gang members becomes convinced that Louis' younger brother is a police informer.
Six months before his retirement from the criminal police, inspector Joss finds his colleague Gouvion dead, in a poorly faked suicide attempt. Joss loses his temper, and investigates on his own, which leads him through the bas-fond of Paris...