"Avatar Aang travels to the spirit world to parlay 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"--Back cover.
Note
Based on the television series "Avatar: the last Airbender" created by Michael Dante DiMartino and Bryan Konietzko.