A Special Boy

Gordon Bennett is a boy with special talents. Those 'talents' first manifest themselves when he is only 5 months old, and key events in his childhood indicate that his powers are growing as he gets older. Who (or what) is Zack, and why can't anyone else see him? How do Gordon and Zack deal with bullies (and fairies, ghosts and wizards)? How seriously weird do things get around Gordon's eleventh birthday, when his spirit is transported to Avalon and he meets the greatest wizard our world has...