A new boss for dad; a new schoolmate for Boule. New problems in sight.

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!"