Damon Knight 
Man in the Tree [EPUB ebook] 

Gene Anderson was born in Oregon, in the twilight post-war years, into the most ordinary circumstances imaginable.Gene is endowed with powers. He can look into the other worlds that are all around him. He can make things happen. He can hurt and he can heal.His life changes dramatically when another boy is killed in a tragic accident, and Gene runs away. He is only nine. As he grows to 8’6" tall, his wanderings take him round the world in search of a remarkable destiny.