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!

• The official continuation of Airbender from its creators, Michael Dante DiMartino and Bryan Konietzko!

• Avatar: The Last Airbender-The Promise has sold almost two hundred thousand copies!

Source: Buzzfeed.com