Ariol has an enemy! A real enemy with all the trimmings: Tiberius! This mean cat is always looking for trouble and just can't help but make fun of everything and everyone – not even Ariol's great idol, the stallion Heldenhuf, is spared! And Petula, the sweetest cow in the whole class, actually likes this rascal! Oh, school could be so nice if only Tiberius weren't around... Emmanuel Guibert and Marc Boutavant have created a true figure of identification with Ariol. Or in the words of a young reader: "You read Ariol, and suddenly it happens to you too.".