Citra and Rowan have disappeared. Endura is gone. It seems like nothing stands between Scythe Goddard and absolute dominion over the world scythedom. With the silence of the Thunderhead and the reverberations of the Great Resonance still shaking the earth to its core, the question remains: Is there anyone left who can stop him?
The answer lies in the Tone, the Toll, and the Thunder.
It's been three years since Rowan and Citra disappeared; since Scythe Goddard came into power; since the Thunderhead closed itself off to everyone but Grayson Tolliver.
In this pulse-pounding finale to Neal Shusterman's internationally bestselling trilogy, constitutions are tested and old friends are brought back from the dead.