Fire Lord Zuko enlists the aid of Team Avatar-and the most unlikely ally of all-to help uncover the biggest secret of his life. What happend to his mother?

"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.