With too many secrets of his own, Hiro is tasked to discover a traitor. His most dangerous secret, also his greatest advantage, becomes his riskiest move to uncover the truth.

Human armies surround the Rock Clouds with poisoned arrows in their quivers. Even with the help of the centaurs and other rucks, the dragons await their own destruction.

A previously unknown and powerful ally appears, but who will they defend?

When all secrets are revealed and every truth comes to light, The One must unite or all will be utterly destroyed in the Krusible.