Jinx: The Wizard's Apprentice:

Never stray far from the path is the rule every child in the Urwald Forest follows. Every child, that is, except a boy named Jinx. Jinx is an apprentice to Simon, a wizard who is just a little bit evil. When one of Simon's spells robs Jinx of his ability to see other people's thoughts, he decides to head off into the forest to try recover his magic. Jinx's mission brings him face to face with a very evil, soul-sucking wizard, the terrible Bonemaster. With help only from Elfwyn, who is cursed with a truthtelling spell, and Reven, who is far too polite to be useful in a fight, it looks like Jinx's magic could be gone forever...