Avatar: The Last Airbender: Imbalance, book 2
Faith Erin Hicks, Michael Dante DiMartino, Bryan Konietzko et Peter Wartman2019

There's something fishy going on in Cranefish Town, and it's up to Aang, Katara, Sokka, and Toph to find out what, before the simmering conflict between benders and non-benders boils over into all-out war. But danger lurks where they least expect it, and uncovering the truth will reveal a threat unlike any they've ever faced--and a fateful choice for Aang he can never unmake !