As the only female Seminus demon ever born, master assassin Sinead Donnelly is used to being treated like an outcast. She spent decades enslaved, and now vows she'll die before she'll relinquish her freedom again. Then Sin's innate ability to kill her enemies goes awry: She creates a lethal new werewolf virus that sparks a firestorm of panic and violence.
Half-werewolf, half-vampire Conall Dearghul is charged with bringing in Sin to face punishment for the plague.