Four guardians... One mortal girl... A forbidden bond... Nia's long-awaited day is coming: her marriage to her betrothed, Celyn. So when news of Celyn's death reach her, she is willing to do anything to bring him back, even venture to the forbidden Annwn, where the power to bring the dead back to life lies. But the path is fraught with dangers. And guarding the way are the four princes of death: Cadfael, Gareth, Bran, and Rhys. Though that is soon about to change. As the irresistible beauty and resolve of the mortal girl penetrate their defences, the godly princes find themselves lending their aid to Nia. As their journey continues, the princes realise that the mortal girl might hold more power over their lives than they over hers.