In a world where vampire hunters are born with silver blood that's lethal to the undead, 28-year-old Elena Blackwood stands out as the most gifted hunter of her generation. Her unique ability to sense vampires from miles away has made her the Vatican's most effective weapon in their secret war against the vampire monarchy.

Everything changes when Elena's routine hunt leads her to Sebastian Dracul, the notorious Dark Prince of the vampire realm, who's rumored to have killed hundreds of hunters. During their first confrontation, instead of her silver blood weakening him, their first touch creates an explosive chemical reaction. Each subsequent contact gradually transfers his immortality to her, while slowly making him human – a phenomenon that hasn't occurred in over a thousand years.

Captured and brought to his gothic castle in the Carpathian Mountains, Elena discovers the dark truth: Sebastian has been searching for her. A ancient prophecy foretold of a hunter whose kiss could break the vampire curse, but at a devastating price. Every transfer of power brings them closer to breaking the curse that has imprisoned vampires in their bloodthirsty state, but it also risks releasing Lamia, the original vampire queen, whose malevolent spirit is bound to the curse itself.

As Elena finds herself drawn to Sebastian's complex nature – a being who's lived centuries fighting his own darkness – she uncovers his tragic past. He chose to become a vampire to save his kingdom from Lamia's plague, sacrificing his humanity to protect others. Their growing love is complicated by the arrival of Elena's mentor and father figure, Cardinal Kane, who has his own hidden agenda regarding the prophecy.

Elena becomes torn between her duty as a hunter, her love for Sebastian, and the weight of a choice that will affect both their races. The Vatican wants her to complete the transfer, hoping to eliminate all vampires, while vampire rebels plot to stop her from breaking their immortality. Meanwhile, signs of Lamia's influence grow stronger, threatening to possess Elena if she continues to absorb Sebastian's power.

In a race against time, Elena and Sebastian must find a way to break the curse without unleashing Lamia, all while fighting against both their kinds who want to keep them apart. Their love is tested through betrayal, sacrifice, and the realization that redemption comes with a price neither may be willing to pay.

The story culminates in a ritual during a blood moon, where Elena must make an impossible choice: complete the transfer to save humanity but lose Sebastian to death, or find a way to share their power and face an eternal existence walking the line between light and darkness – together.

This dark, passionate tale weaves together elements of gothic romance, political intrigue, and supernatural destiny, exploring themes of sacrifice, redemption, and the transformative power of love. The story challenges the boundaries between good and evil, duty and desire, while delivering an emotionally charged romance between two people who are destined to either save or destroy each other.