ISBN-13: 9781616552961 / Angielski / Miękka / 2014 / 80 str.
Avatar Aang asks his friends to help him honour Yangchen's Festival - one of the highest Air Nomad holidays, which hasn't been celebrated in over 100 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 something more mysterious happening?