After her vampire lover, Eli Dupre, was seemingly murdered by a fallen angel, Riley Poe receives word that he's actually trapped in an alternate dimension, where hell on earth is revealed and dark forces reign. Riley's been there before, and it nearly destroyed her. But her efforts to find Eli are thwarted by a new foe stalking the Scottish highlands: a powerful vampire is killing humans. Riley knows how to handle a vamp, and with the WUP team by her side, she's determined to take down the rogue. But then Riley discovers a connection between the slaughter and Eli.