Toby Lolness may be just one and a half millimeters tall, but he's in big trouble. His father, a brilliant scientist, has discovered an alarming truth about the great oak Tree that Toby's people call home: it's alive. And if they continue digging deeper into the heart of the Tree, their whole civilization could be at risk. In an attempt to silence Professor Lolness, the builders who control things in the Tree take him and his family captive. But Toby manages to escape, taking with him the secret to the Tree's energy - a secret his pursuers will do anything to get their hands on, even if it means killing an innocent boy.
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 inflicting 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. In the much-anticipated sequel to the award-winning Toby Alone, the compelling eco-adventure reaches its gripping conclusion.