Violet lives in a totalitarian world in the future, ruled by Daxus. Once she was a human and the assistant of his husband, a scientist, murdered by the police forces of Daxus, who has turned into vampires a considerable part of the human race just to enlarge his forces. Violet has the task of rescue a secret weapon: a boy named Six. After knowing the real intentions of this people with the boy, Violet takes him away and she'll be chased by Daxus, because Six carries in his blood a rare cure, which could heal Violet and all the vampires.—Alejandro Frias