Rival nations Emberfall and Syhl Shallow process the revelation that former royal guardsman Grey is not only the long-lost heir of Emberfall, but also the first known magesmith in years. Prince Rhen and Princess Harper prepare for a clash with Syhl Shallow, where Lia Mara, now queen, faces criticism for her controversial alliance with Grey. Even as Grey learns to wield his magic for good, Rhen is cornered by the vengeful enchantress Lilith, whose magesmith family was destroyed by Rhen's family years prior. The memory of the brutal physical and psychological abuse Rhen and Grey endured while under Lilith's curse prevents Rhen from believing that any magic user, even his half brother and former confidant, can be trusted. Meanwhile, the brothers' charismatic, loyal, and headstrong partners experience their own internal conflicts: Lia Mara questions her commitment to peace, and Harper draws uncomfortable connections between her parents' marriage and her own relationship with Rhen. The political and romantic stakes are at an all-time high as the young rulers and their allies must navigate relationships, responsibilities, and existential questions about trust, legacy, and power before it's too late. Kemmerer blends contemporary American speech and progressive values with medieval European--inspired cultural elements to successfully construct a dynamic, boundary-pushing exploration of familiar fairy tales, although the systems of magic themselves could be more highly developed. Major characters appear to be White; Harper has cerebral palsy. Offers one satisfying twist after another. (map) (Fantasy. 13-18) Copyright (c) Kirkus Reviews, used with permission.