Synopsis:

Although the one-hundred-year War is finally over, tensions run high as thirteen-year-old Avatar Aang and seventeen-year-old Zuko are put on a "collision course" after the Avatar travels to a Fire Nation colony named "Yu Dao", and finds "tension between neighbors" – a threat that may "shatter the world's newfound peace". The unfinished conversation between Zuko and Ozai about the whereabouts of Ursa, Zuko's long-lost mother, is completed, but the conversation takes a different path after Zuko asks the question and her fate still remains unknown. Zuko forces Aang to promise to kill him if he becomes like his father, the deposed Fire Lord Ozai.