The measure of the moon
(Book)

When eight-year-old Greer Donner falls off his horse in the Washington wilderness, he braces himself to face the long hike home alone. But screams pierce the darkness, and he stumbles upon a dead-end road where a man is beating a woman|nearly to death. In a moment of courage, he stops the assault, but he's left to face the man, who turns his wrath into an ominous threat: if the boy ever reveals what he has seen, his family will pay the ultimate price. The secret Greer now carries begins his emotional unraveling. -- amazon.com