In the hidden underworld of the Thai elite, Force is a Pureblood vampire-a six-hundred-year-old aristocrat who has grown weary of his immortality. He is cold, lethal, and has spent centuries avoiding "The Tether," a legendary soul-bond that supposedly binds a vampire to a human "Vessel." Book is a history student and a part-time archivist at a private museum. He is skeptical of anything he can't prove with a document, until he accidentally cuts his hand on an ancient dagger while cataloging Force's family heirlooms. The scent of Book's blood doesn't just trigger Force's hunger; it triggers a dormant, psychic bond that makes Force's dead heart beat for the first time in centuries. But there's a catch: Book's blood is "The Cure," and every time Force drinks from him, the vampire becomes more human, and the human becomes more fragile.