Toby's world is under greater threat than ever before.

A giant crater has been dug right into the centre of the Tree, moss and lichen invade the branches, and one tyrant controls it all.

Leo Blue, once Toby's best friend, now his worst enemy, is holding Elisha prisoner, hunting the Grass People with merciless force, capturing all who stand in his way, inflicting a life of poverty and fear.

But returning after several years among the Grass People, Toby will fight back. And this time he's not alone. A resistance is forming.