Apothecary apprentice Tessa Cade is tired of seeing her people die. King Harristan and his cruel brother, Prince Corrick, ignore the suffering of their people and react mercilessly to any sign of rebellion, even as a sickness ravages the land. That’s why she and her best friend Wes risk their lives each night to steal the petals of the delicate Moonflower, the only known cure. But it’s not enough to keep everyone she loves safe―or alive. When Prince Corrick commits an act of unspeakable cruelty, Tessa becomes desperate enough to try the impossible: sneaking into the palace. But what she finds there makes her wonder if it's even possible to fix their world without destroying it first.