The book follows Nesta Archeron, a High Fae who struggles to find her place in the world after being forced into the Cauldron. She is constantly in close proximity to Cassian, a battle-scarred warrior, and the two must confront their pasts to stop a dangerous new alliance from threatening the peace. Against the backdrop of a war-torn world, Nesta and Cassian search for acceptance and healing in each other's arms.