Andrew and the Firedrake — Douglas Wilson

Andrew awakens in a strange garden perched on the side of a mountain.The boy can't remember who or where he is. But he does know that he has a task to do-and it's very important he complete it exactly the way he was instructed, no matter who-or what-tells him otherwise.At every step of his quest. Andrew is faced with a choice: will he do what he knows he must, or will he take a shortcut? He will meet new friends, bitter enemies, and some who are a little of both as he discovers his story is at once stranger and more magical than he thought.