After nine years of desperate searching for the next Avatar, the discovery of young, charming Avatar Yun has brought stability to the four nations-that is, until Earth Kingdom-born Kyoshi, Yun's unassuming friend and servant, demonstrates remarkable bending during a mission to the South Pole. With the identity of the true Avatar at stake and the growing unrest among her allies turning into violence, Kyoshi is forced to flee the Avatar mansion with her fiery friend Rangi, taking little more than the metal war fans and headdress her parents left behind.