From the New York Times bestselling author of Sorcery of Thorns and An Enchantment of Ravens comes a thrilling new YA fantasy about a teen girl with mythic abilities. This is the perfect read for fans of Cassandra Clare, Sarah J. Maas's A COURT OF THORNS AND ROSES series, and Holly Black! Artemisia is training to be a Gray Sister, tasked with cleansing the bodies of the dead so that their souls can pass on; otherwise, they will rise as spirits with a hunger for the living. When her convent is attacked, Artemisia defends it by awakening a revenant. Wielding this ancient spirit's extraordinary power almost consumes her - but only a vespertine, a priestess trained to wield a revenant, has any chance of saving Loraille. As Artemisia unravels a sinister mystery of saints, secrets and dark magic, her bond with the revenant grows. And when a hidden evil begins to surface, she discovers that facing this enemy may require her to betray everything she's been taught to believe - if the revenant doesn't betray her first.