In the frozen North, where breath freezes in the air and clans survive in vast and impenetrable roundhouses, Raif Sevrance of Clan Blackhail discovers his ability to heart-kill men. The young bowman becomes an outcast after he witnesses a brutal massacre by his clan. Meanwhile, in a far-off city to the south, Ash March, a foundling raised as a king’s daughter, discovers a dangerous power building inside her that she must release—or it will consume her. Hunted across a barren wasteland, Raif and Ash are drawn together toward an ancient evil waiting in a cavern of black ice.