Following the events of Stormdancer, the Watcher receives a vision in a dream of a city in turmoil. The dream haunts him, as does the voice that insistently repeats, 'Help me,' night after night. Leaving the safety of the tower of scientists behind, the Watcher and his friends embark on the final leg of their journey to locate the source of the message and come face to face with their most difficult obstacle yet: doubt.

Though they trust the Watcher, Kristen and the others can't help but fear that the voice in his head is driving him mad and leading them all to their deaths. Even the Watcher is afraid. He knows that listening to this voice risks everything he has obtained up until this point, but he can't help but continue to follow it, driven forward by curiosity and an instinctive need.

Beyond volcanoes, rock people, and a desert of nothing but crystal, lies the City at the End of the World. And there, the Wandering God awaits...