Ducobu has once again been expelled. This time, to avoid ending up in boarding school, he's only got one option left open to him. He must succeed at Saint Potache school. Everyone's favorite dunce must surpass himself at inventing new ways to copy from his neighbors and to cheat. Challenges await him, for Monsieur Latouche, his formidable teacher, is a fierce opponent, and Léonie, the top student, won't be charmed by him for long, making copying from her very difficult.