In the aftermath of Ireland's battle with her ancient enemies, Queen Isolde orders her cousin, smuggler Duncan O'Malley, to assume the throne of fairy as King Finvara. He's a fish out of water when it comes to nurturing the alliance between Ireland's mortal and fairy peoples. And the queen wants him to wed the daughter of Ireland's enemy, the king of Icelandic shadow elves, to help keep the peace. But the Irish think of the elves as goblins, and Finvara refuses.
Elven princess Koli, affronted by the king's rejection-along with his decision to bring her to court as little more than a captive-vows vengeance. Shortly after her arrival, she uncovers a plot that would bring swift satisfaction. A dark and powerful fairy lord, Far Dorocha, wants to take Finvara's crown and lead both the fairy and elven people to war against the Irish. And he wants Koli to help him.
It's the perfect setup for revenge, but Koli soon discovers that Finvara's not the haughty lord she believed him to be. And as she navigates treacherous waters inside the court, she gets glimpses of the magic and passion that have been slumbering inside her. She must choose a side in the new battle for Ireland-will it be the fearsome father she has served for nearly a century, or the fairy king who has helped awaken her to herself?
Miss Ada Quicksilver, a student of London's Lovelace Academy for Promising Young Women, is spending her holiday in Ireland to pursue her anthropological study of fairies. She visits Dublin's absinthe bars to investigate a supposed association between the bittersweet spirit and fairy sightings.
One night a handsome Irishman approaches her, introducing himself as Edward Donoghue. Edward takes absinthe to relieve his sleepwalking, and she is eager to hear whether he has experience with fairies. Instead, she discovers that he's the earl of Meath, and that he will soon visit a mysterious ruin at Newgrange on the orders of his cousin, the beautiful, half-mad Queen Isolde. On learning about Ada's area of study, he invites her to accompany him.
Ada is torn between a sensible fear of becoming entangled with the clearly troubled gentleman and her compelling desire to ease his suffering. Finally she accepts his invitation, and they arrive in time for the winter solstice. That night, the secret of Edward's affliction is revealed: he is, in fact, a lord in two worlds and can no longer suppress his shadow self.
Little does either of them realize that their blossoming friendship-and slowly kindling passion-will lead to discoveries that wrench open a door sealed for centuries, throwing them into a war that will change Ireland forever.
