The four heroes of Erdas are fugitives on the run in this new chapter of the New York Times bestselling series!

Conor, Abeke, Meilin, and Rollan -- once Heroes of Erdas -- are now wanted fugitives. Framed for a crime they didn't commit, they've been hunted across the globe by the ruthless mercenaries, the Oathbound.The four friends have traveled to the deserts of Nilo seeking answers, along with an ancient and powerful relic that's connected to the history of their world. There they discover a vast, secret library dedicated to preserving the wisdom of Erdas. But this library houses more than just tomes and scrolls. Guarding this knowledge are their old friends Takoda and Xanthe, along with Kovo the Ape. With the Oathbound following close behind, can the heroes risk branding their friends as traitors?