Quadehar the sorcerer - Erik L'Homme

Imagine a lost isle, hidden behind magical doorways, caught betweentwo worlds - the real world and an uncertain place of strangecreatures and fantastical lands. Here, Robin Penmarch enjoys ordinarylife, spending time with his friends and playing computer gameswhilst protected by extraordinary magic and brave knights inarmour. But the dark forces of The Uncertain World are rising, andwhen Robin is unexpectedly chosen as apprentice to Quadehar theSorcerer, he discovers the truth about himself and the threat tthe Lost Isle. Soon Robin and his friends find themselves crossngover into The Uncertain World. There they face bandits, monstersand a shadowy enemy that will stop at nothing to capture the boyand his special powers.