Avatar / Yang, Gene Luen

"When Zuko discovers a clue to Ursa's fate, he enlists the aid of Team Avatar--and enters into a tense alliance with his sister, the deadly and insane Azula--to finally uncover the truth!"--.

While trying to discover what happened to his mother, Fire Lord Zuko learns something that makes him question everything. His insane sister, Azula, turns the situation to her advantage as she travels with Zuko and his friends Aang, Katara, and Sokka.

"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.

Fire Lord Zuko asks for Aang and Team Avatar's help in locating his mother, who was banished years earlier, but he has invited an unlikely ally to join the search, which puts the group on edge.