Roo, considered by almost everyone to be a difficult boy, is haunted by nightmares of being left alone. After all, who wants a difficult boy around? His friends can't help - they have nightmares of their own. To make matters worse, much much worse, Roo gets lost on an overnight ride, and crashes deep into a dark, densely-forested valley, where he is attacked by the terrifying creatures from their nightmares. They are real! This is their land. And Roo can't escape.