Once again, Jengo's ghost, Lily, needs his help. The adventure unfolds when he and his pal, Billy, find a half-grown Weimaraner puppy half-beaten to death just inside the boundary of the national forest. They soon find the tall trees hide dark secrets. The atrocious treatment of the dog leads to clues of a plot to bring illegal hunting into the forest. When Lily's father, as game warden, investigates, he gets too close to the truth and mysteriously disappears. Jengo and Lily fear for his life and recruit their pals to help search for him. Lily's ghostly skill is the catalyst for their plan of action, but will they be in time or will they, too, fall into the hands of the criminals?