In the kingdom of Nine Lands, incursions by an ancient enemy are dealt with by the Invoker clans, warriors of noble blood who can summon their ancestors to fight with them in battle. But when Temi, a commoner from the slums, accidentally invokes a powerful spirit, she finds it could hold the key to ending this centuries-long war. But as secrets long buried come to light, Temi will learn that not everything that can be invoked is an ancestor, and some of the spirits that can be drawn from the ancestral realm are more dangerous than anyone can imagine.
