Kyoshi's place as the true Avatar has finally been cemented-but at a heavy cost. With her mentors gone, Kyoshi voyages across the Four Nations, struggling to keep the peace. But while her reputation grows, a mysterious threat emerges from the Spirit World. To stop it, Kyoshi, Rangi, and their reluctant allies must join forces before the Four Nations are destroyed irreparably. This thrilling follow-up continues Kyoshi's journey from a girl of humble origins to the merciless pursuer of justice still feared and admired centuries after becoming the Avatar.