Calwyn has lived all her life behind the high ice-wall that guards the sisters of Antaris from the world of Tremaris. The sisters practice ice chantment -- one of the Nine Powers of chantment, a form of magic worked through music. But when Calwyn finds an Outlander man fallen, wounded, through the wall, she is drawn to him ... and drawn into a wondrous, dangerous adventure that takes her outside the wall and to the limits of her own powers, as she, the Outlander Darrow, and others unite to defeat the sorcerer Samis, who seeks to claim all Nine Powers and become the Singer of All Songs.