Finding a clue about his mother at last, Zuko enlists the aid of Team Avatar - and the most unlikely ally of all - to help uncover the biggest secret of his life.

When Katara and Sokka return home to the Southern Water Tribe, they are shocked to find that it has gone from a small village to a bustling city. Malina, a Northerner, is behind the change and plans to unify the Water Tribes, but Gilak, a Southerner, leads a fierce rebellion to stop her. In the face of these two opposing tribes, Katara will have to make peace with her nostalgia and mistrust to save the home she loves from being permanently torn apart....

"Avatar Aang discovers a jointly owned Fire Nation and Earth Kingdom refinery."--

Avatar Aang travels to the spirit world to parley with an ancient power, bringing Fire Lord Zuko ever closer to discovering the truth about his mother's fate--and his own past. Yet Zuko's sister Azula is becoming increasingly dangerous, threatening to ruin everything that Zuko, Aang, Katara, and Sokka have struggled to achieve on their search.

As Avatar Aangand his friends confront an ancient spirit determined to destroy a town on land sacred to the Air Nomads, Toph and Aang find themselves on opposing sides in a battle of gigantic proportions. If Toph and Aang don't put aside their differences, there's more at stake than just their friendship!"--Cover.

The Fire Nation is threatened by a prophecy told by the Kemurikage, mysterious figures thought only to exist in legend: remove Zuko from the throne, or the country will perish!