Prepare for the jaw-dropping finale to the beloved New York Times bestselling series. The long-imprisoned jinn are on the attack, wreaking bloody havoc in villages and cities alike. But for the Nightbringer, vengeance on his human foes is just the beginning. By his side, Commandant Keris Veturia declares herself Empress and calls for the heads of any and all who defy her rule. At the top of the list? The Blood Shrike and her remaining family. Laia of Serra, now allied with the Blood Shrike, struggles to recover from the loss of the two people most important to her. Determined to stop the approaching apocalypse, she throws herself into the destruction of the Nightbringer. In the process, she awakens an ancient power that could lead her to victory—or to an unimaginable doom. And deep in the Waiting Place, the Soul Catcher seeks only to forget the life—and love—he left behind. Yet doing so means ignoring the trail of murder left by the Nightbringer and his jinn. To uphold his oath and protect the human world from the supernatural, the Soul Catcher must look beyond the borders of his own land. He must take on a mission that could save—or destroy—all that he knows.

Beyond the Martial Empire and within it, the threat of war looms ever larger. Helene Aquilla, the Blood Shrike, is desperate to protect her sister's life and the lives of everyone in the Empire. Yet danger lurks on all sides. Emperor Marcus, haunted by his past, grows increasingly unstable and violent, while Keris Veturia, the ruthless Commandant, capitalizes on the Emperor's volatility to grow her own power—regardless of the carnage she leaves in her path. Far to the east, Laia of Serra knows that the fate of the world lies not in the machinations of the Martial court, but in stopping the Nightbringer. During the hunt to bring him down, Laia faces unexpected threats from those she hoped would help her, and is drawn into a battle she never thought she'd have to fight. And in the land between the living and the dead, Elias Veturius has given up his freedom to serve as Soul Catcher. However, in doing so, he has vowed himself to an ancient power that demands his complete surrender—even if that means abandoning the woman he loves.