A police chief in northern France tries to solve a case where an old woman was brutally murdered on Christmas Eve. However, in a neighborhood rife with crime, everyone seems to be a suspect.
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.
Cesar is a young schoolboy living in Paris with his family. Their life is ordinary, but Cesar wants more excitement (which he creates, in one instance, by claiming to his teachers that his father has been arrested). During the school holidays, Cesar and his friend Sarah decide to help their mutual friend, Morgan, find his father who supposedly lives in London. Each one tells their parents that they're staying with the other two, and together they sneak out to begin their search.
