A mortal girl. Four charming celestial princes. A forbidden quest.
As Nia ventures to the forbidden Annwn to find the magic to revive her dead betrothed, she meets the four guardians of Annwn: Cadfael, Gareth, Bran, and Rhys. She knows she can't fully trust these celestial princes, no matter how charming they are, but they are her only way to her destination. However, the more time she spends with them, the more she begins to question her resolve and where her heart truly lies. As for the celestial princes, they are supposed to stop Nia, but her feisty character draws them to her. To help her, they are willing to break all the rules, risking their very existence.