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!