Bound by an ancient blood oath, the Deer Clan must offer a princess to the Abyss. Pure-blooded princess Elowen discovers her fiancé Rowan loves only his half-blood sister Lyla and has used her as a shield. Brokenhearted, Elowen volunteers as the sacrificial bride for the slumbering Fire Dragon King Felix.
After surviving the deadly Blood Summoning trial, she awakens the hundred-year-dormant Felix and gains his devoted protection. Tormented by regret and jealousy, Rowan and Lyla resort to forbidden magic and