The Gray Armageddon has destroyed most of humanity. Vampires have slinked out of hiding, penning the few human survivors as blood cattle. Young Julia Poe survives the horror. She has dodged the undead since she was eight years old in downtown Los Angeles and has the only untapped vein in the new realm. Now she celebrates her 22nd birthday as a cattle rustler, fighting the vampire factions alongside a gun-toting nun with an even bigger vendetta. Kaleb Sainvire, the master vampire and architect responsible for `milking cattle,' is first on Poe's list. That is, if she isn't taken by his vampiric allure.