Lanfeust, accompanied by his 4 new wives and d'Hebus, went in search of Ryplëh, the young sage of the Conservatory of Eckmül, witness of the assassination of Nicolede and the only one to be able to innocently of this crime. But Qynosta, the wise man who became Venerable, launched in pursuit of him Zakhöl, the terrible half troll. He must find Ryplëh before Lanfeust and at all costs eliminate him, if he wants to keep full powers....