As ancient Transylvania struggles into modern times, old myths and superstitions blur with reality. Two American students, Michele and Lillian, join their Romanian friend Mara in the Carpathian Mountains to study the legends of vampires. While the three innocents explore the mysterious village culture and rituals, a suppressed evil rises again and casts its shadow upon the land. Unknowingly snared in a centuries-old family feud, the girls fall into the clutches of Radu ; a diabolical vampire prince whose madness and bloodlust know no bounds. To claim his birthright - the ancient Bloodstone - Radu kills his father and hunts his noble half brother Stefan. Dangerous passions erupt into violence as the vampire brothers each become obsessed with Michele and begin to battle for her immortal soul. Stefan's forbidden love for Michele endangers her friends, as the jealous Radu plots to make them his undead consorts. With Stefan's help, the girls fight for their lives against Radu and his minions - the Subspecies - an army of hellish creatures born of his own flesh. Will they survive the sunrise or will Radu curse them to eternal night?
Two vampire brothers, one good, the other evil, are reunited by the death of their father. Three beautiful young research students, including the good brother's true love, are caught in the supernatural sibling's struggle for control of the vampire kingdom. Sequels: "Bloodstone: Subspecies II" and "Bloodlust: Subspecies III."