Toby's world is under greater threat than ever before. A giant crater has been dug right into the center of the Tree, moss and lichen have invaded the branches, and one tyrant controls it all. Leo Blue, once Toby's best friend, is holding Toby's beloved Elisha prisoner, hunting the Grass People with merciless force, and in?icting a life of poverty and fear on the Tree People. But after several years among the Grass People, Toby has returned to fight back. And this time he's not alone: a resistance is forming.