July 1996, the beach, the sea, the sun. Sophie, 10, spends her summer vacations with her mother and her cousin Laurence. But Laurence has grown up and her mother's thoughts are elsewhere. While the whole country is still looking for two missing little girls, Sophie discovers that this will be her last summer as a child.

Everything goes for the best in Fanny's life without stories ... until she discovers that her beloved son, Arthur, nine, is the scapegoat of three boys at his school. Fanny will not leave her son alone in front of these little executioners: she will give these dirty kids the change of their room. Thunderstorms and playground traps, now it will be "an eye for an eye and a tooth for a tooth!"

Agathe Langlois, Parisian until the end of the nails well varnishes, is delighted: she is going to be confirmed as a professor of English. The happiness of the good news will not last as she learns that she is deployed to the countryside.