Kaelie Thorne lives in the forgotten Grey City, a dying human settlement built far beyond the borders of the werewolf territory ruled by the feared Iron Claws. A massive boundary… forest and guarded borders separate the human slums from the wolves' domain, and crossing that line is punishable by death. Kaelie spends her days selling dried roses to survive and caring for her dying grandfather, until desperation forces her to do the unthinkable… cross the forbidden boundary into the wolves' land to search for a rare blue flower. But the moment she steps into the territory surrounding the towering Obsidian Spire, she witnesses a brutal execution carried out by the ruthless Alpha himself, Alpha Jaxen Vane. When he catches the human trespasser, killing her should be effortless… until his wolf recognizes her scent. Kaelie isn't just a human. She's his fated mate. Worse still, her blood carries the ancient scent of the Witch-Queens–the sworn enemies wolves were born to destroy. Instead of tearing her apart, Jaxen takes Kaelie captive inside the Spire, where their dangerous bond begins to awaken something far darker than either of them expected. Strange power begins to stir inside Kaelie, a forbidden force known as the Void–an ancient magic said to devour the souls of wolves and bring the end of their kind.