To save his seriously ill mother, young human Tavian is forced to disguise himself as a woman and impersonate the missing vampire countess Oriana, entering into an arranged marriage with the cold vampire lord Stellan. After Stellan sees through his identity on their wedding day, the two strike a secret pact, and what starts as a sham relationship gradually turns real amid the peril-ridden vampire court. However, when the real Countess Oriana returns and teams up with a sinister vampire hunter to frame him, Tavian is pushed into a life-or-death crisis. Defying the pressure of the entire council, Stellan follows the pull of their soul bond mark to rush through a sea of fire and rescue Tavian with deep devotion. He finally exposes the conspiracy in public, kneels to propose to Tavian—who has restored his true male identity—and the two forge an eternal blood covenant together.
