Avatar : the last airbender ; the promise
(Book)

At head of title: Nickelodeon.

Following the war, Aang travels to a colony in the center of Earth Nation where friction between neighbors threatens the world's new peace, pitting the Avatar against one of his closest friends. Aang and Katara work tirelessly to prevent a dispute between Fire Lord Zuko and Earth King Kuei that could plunge the world back into war, while Sokka helps Toph prepare her metalbending students against a rival class of firebenders. Then, the Harmony Restoration Movement has failed, and the four nations are plunged back into war! In the midst of the battle, can Aang and Fire Lord Zuko mend the rift between them, or will Aang be forced to take actions that can't be undone?