Avatar: The Last Airbender: Imbalance, Part 1 (Imbalance, #1)

When Aang, Katara, Sokka, and Toph return to Earthen Fire Industries--the factory owned by Toph's father--Team Avatar finds that the once small town is now booming. Expecting a warm welcome, Aang is surprised when their arrival is met with unimpressed, cold-shouldered spectators. As soon as the team is asked for help at a business council meeting, the reason for the slight becomes clear--a massive bender versus non-bender conflict has gripped the town and is threatening to turn violent.