To settle a centuries-old war, Y/N , the radiant Princess of Light, is bartered to Cyprian, the brooding King of Shadows. Bound by the magical Aethelgard Accord and a soul-tethering ring, they are forced into a shared existence within the gothic Obsidian Citadel. Behind closed doors, their mutual hatred ignites a dangerous, carnal friction turning their shared bedchamber into a battlefield of dominance, shifting shadows, and a slow-burn desire that threatens to eclipse both their kingdoms.