With each passing day, Kelsea Glynn is growing into her new responsibilities as Queen of the Tearling. By stopping the shipments of slaves to the neighboring kingdom of Mortmesne, she crossed the Red Queen, who is sending her fearsome army into the Tearling to take what is hers. But as the Mort army draws ever closer, Kelsea develops a mysterious connection to a time before the Crossing, and she finds herself relying on a strange and possibly dangerous ally: a woman named Lily, fighting for her life in a world where being female can feel like a crime.