Can someone send me a book they have read and then explain what the whole book is about. But the book can't already be made into a film.

Answer: Where I Belong by Mary Downing Hahn

Explanation:

It's about a boy, Brendan, who has been a foster kid all his life, is a social outcast everywhere. He finds solace in the woods behind his house, where he builds his own castle, and befriends a man he calls The Green Man. He learns to cope, and even makes a new friend during mandatory summer school.