But when cryptic visits from the spirit of Avatar Yangchen lead Aang to a refinery operating on land sacred to the Airbenders--they soon find themselves in peril as a dangerously powerful ancient spirit awakens with vengeance and destruction on its mind! This collection of The Rift parts 1-3 is collected in a paperback omnibus, continuing the long-running official continuation of the hit Nickelodeon animated series Avatar: The Last Airbender!