The Girl Who Loved Tom Gordon by Stephen King

On a 6 mile hike on the main New Hampshire branch of the Appalachian trail 9-year-old Trisha McFarland quickly tires of the constant Pickering between her older brother Pete and her recently divorced mother. But when she wanders off by herself and then tries to catch up by attempting a shortcut, she becomes lost in a wilderness maze full of peril and terror. 
Good condition soft cover pocket book.