Lavigne Summer Pendleton was a soul defined by her innocence and warmth, a girl who never expected to be caught in the crosshairs of a loveless arrangement. When she is forced into an accidental marriage with the cold and calculated Angello Clinton Blackthorn, her world turns into a nightmare. Within the walls of their grand mansion, Angelo makes it his mission to hurt her, dismissing her kindness and pushing her to the brink of despair.

Born "wolf-less" into a pack that values only power, Elara is considered a useless anomaly and is sacrificed to settle an ancient blood debt. She is sent to the Forbidden Forest to wed the Cursed Lycan King, a man rumored to be a mindless monster who has slaughtered every bride before her. Upon arrival, Elara discovers the King is not a beast by choice, but is trapped in a dark magical curse that feeds on the shifting energy of werewolves. Because she has no wolf, she is the only person who can touch him without being destroyed, making her the "Key" to his salvation. As she heals him, a fierce and possessive obsession grows between them, transforming the "monster" into her most lethal protector. When her original pack attempts to reclaim her to exploit the King’s restored power, Elara must choose between remaining a sacrifice or rising as a legendary human Luna to lead an empire of monsters against those who discarded her.