Avatar Aang asks his friends to help him honor Yangchen's Festival--one of the highest Air Nomad holidays, which hasn't been celebrated in over one hundred years.
But cryptic visits from the spirit of Avatar Yangchen herself lead Aang to discover a jointly owned Fire Nation and Earth Kingdom refinery--operating on land sacred to the Airbenders! Is this the cause of the pollution Aang finds there, or is a more mysterious menace afoot?
* The official continuation of Airbender from the original series creators!
* Continues to top the sales charts!
* The perfect companion to The Legend of Korra!
"One of the best new pop culture mythologies to debut in the last decade."--Kotaku
"A fantastic glimpse into the post-series universe."--Bleeding Cool