By Gene Wolfe
Paperback, 430 pages
From the back of the book: A young man is transported from our world to a magical realm that contains seven levels of reality. Very quickly transformed by magic into a grown man of heroic proportions, he takes the name Sir Able of the High Heart and sets out on a quest to find the sword that has been promised to him, a sword he will get from a dragon, the one very special blade that will help him fulfill his life ambition to become a true knight and a true hero. Inside, however, Able remains a boy, and he must grow in every sense to survive the dangers and delights that lie ahead.
I enjoyed the concept of this story, and before I started reading it, the idea had a lot of potential.