DOORS OF GLASS

Book of the Witch's Son, Book 3.

Jeth is haunted by his choice to claim the Moot Crown, no matter how much it has helped humanity. Wearing a crown makes enemies, and foremost among his foes is his own father, the faerie Aneirin. Escaped from his magical prison and reclaiming his power by stealing names, riches, and the changeling Shae, Aneirin threatens humanity itself -- and the Moot Crown can't stop him.