A night of heartfelt conversations and swirling intrigue for Aang and his companions is brought to an explosive halt by a mysterious group of earthbending insurrectionists, and a foe they had thought they left behind comes to their rescue.

Meanwhile, tensions and arguments run high among the Water Nation infiltrators, based on what threatens their military force in the caves below Ba Sing Se, and Katara meets a charismatic young man she thinks could be of use to her...