On the ice planet Nevya, only the Cantrixes--with their flutelike fillas and angelic voices--can bring warmth, light and healing. But the Cantrixes must be formally trained, and a shortage of willing candidates threatens Nevya's survival. Until the Cantrix Sira defies tradition by teaching anyone with the gift of song to sustain life. And though branded a traitor, she is the frozen planet's only hope.