Pour sauver son école, le turbulent mais néanmoins sympathique Henry va devoir s'allier avec son institutrice. En effet, deux méchants inspecteurs d'académie et un directeur d'une école privée viennent faire l'état des lieux avant de prendre une ultime décision quant à la fermeture ou non de l'établissement scolaire... When Henry fails yet again to hand in his homework for the umpteenth time, he has no idea that this will set off a chain of events which will see him forming an unlikely alliance with Moody Margaret, the infuriating girl next door, and his irritating little brother Perfect Peter, outwitting corrupt School Inspectors and toppling an evil Headmaster, winning a talent contest and facing his ultimate nemesis with no way out - all because he is trying to save the very school which he has always professed to hate!