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.

"What hapened to Fire Lord Zuko's mother? Finding a clue 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"--p. [4] of cover, Part 1.

"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 fateand 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!" -- from publisher's web site.

"As fire Lord Zuko continues his quest to uncover his mother's fate, a shocking revelation causes him to question everything he knows. It's an opportunity that his sister, the deadly and insane Azula, will not fail to take advantage of as she joins Zuko and his friends Aang, Katara, and Sokka on their journey into a mysterious forest from which some people never reemerge" -- page [4] of cover.

While planning to celebrate Yangchen's festival, Aang is visited by the spirit of Yangchen herself who leads him to discover a refinery on land sacred to the Airbenders that may be causing the pollution he finds there.

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?

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.

As Avatar Aang and his martial arts friends seek answers to the mysteries surrounding a refinery on land sacred to the Air Nomads, Toph uncovers a startling truth about her father's involvement with the refinery, while Aang travels to the spirit world, discovering a secret as surprising as it is dangerous.

With the help of his friends and his sister Azula, Prince Zuko goes on a quest to find out what happened to his missing mother.

When the Fire Nation begins to believe that the country will perish if Zuko stays in power, Avatar Aang and his friends must protect the ruler.