In the frost-bitten border territories, Preta is an enslaved outcast in her own pack, silenced by a silver-enchanted seal around her throat and forced to serve her ambitious half-sister, Phyna. Phyna is desperate to secure a royal match with the dreaded Obsidian Triplets—Damon, Luther, and Rylan—infamous warlords cursed with shared madness unless they find their true mate. When the brothers arrive at the Bloodmoon Gala, Phyna steps forward to claim the alliance, only for the triplets' bloodline beasts to snap their control.Their mate isn't the pristine sister; it is the mute maid cleaning wine off the marble floor.Taking Preta by sheer force, the triplets bring her to the Black Citadel. Damon seeks to break her silence; Luther investigates the strange, dormant magic humming beneath her scars; and Rylan guards her with terrifying territorial hunger. When Phyna allies with a traitorous councilman named Silas to orchestrate Preta's assassination and steal the mating bond, the assault breaks the silver seal choking Preta's soul. Awakened as the last Prime Sun-Luna, Preta regains her voice and commanding aura, uniting the divided triplet kings to annihilate their enemies and reclaim the throne.