Twelve-year old Tallie knows she shouldn’t break Mother Kyraisa’s rule and summon the lights again. But she does it anyway. When Mother Kyraisa catches Tallie, the ancient nun evacuates the orphanage, ordering it burned immediately. She then crams Tallie into a lead-lined coffin and flees into the desert, whipping the horse the whole way.
With no memories, no heart, or even a name, X is a monster. Fiercest of the Bestials, his predator’s instincts are controlled only by powerful spells binding his life to the Regent’s will. When a flash of apostate magic betrays the hiding place of the late Queen’s daughter, the Regent dispatches X to kill the child—her niece and the long-hidden heir to the throne.
Following the child’s magic, X tracks Tallie to her hiding place. He prepares to kill her, until Tallie surprises him with a sincere request for help.
Tallie’s innocence and trust awaken a small spark of humanity inside X, and he tries to help her. But he remains a monster, bound by instinct and unbreakable oaths. Helping Tallie triggers a ferocious battle, as X fights his primal nature for her life—and his only hope of redemption.
Meanwhile, Tallie grapples with the tragedy of her past and her identity as crown princess. As royal heir, Tallie finds access to immense power—enough to destroy her enemies, but possibly her own soul as well, turning her into a monster far worse than X.