After two years, Tomi makes the bold decision to leave the illegal bloodbending camp he has come to call home. After discovering he can't bloodbend, Tomi makes it his mission to hunt down his mom and figure out why. Before he can find her, Tomi will reunite with Lina, his pre-teen love. Once on board with Tomi's mission, Lina agrees to travel to Ba Sing Se with him. It'll be a dangerous trip, and there's no guarantee Tomi will like what they find. While they're away, Republic City becomes a dangerous place, and Lina's mother is put in jeopardy. The two are forced to choose between Tomi's mom and Lina's, and they won't be able to save anyone on their own. What adventures will Ba Sing Se bring them? What new allies and enemies will they meet?