The Fallen Stars — Stephanie Keyes

When all is lost, he will have to make the ultimate decision. Kellen St. James was just your average seventeen-year-old prodigy, until he eighty-sixed the Lord of Faerie and proposed to a Celtic goddess. Now everything in Kellen's life gets turned upside-down when Calienta, Kellen, and friend, Gabriel Stewart, find themselves on the run from a seriously irritated group of faeries. The worst part? They have zero idea why. Suddenly, Kellen finds himself stuck in the middle of another prophecy that questions everything about him including where his loyalties lie. Plus, Calienta's more than a bit different; she's making choices that he doesn't understand. And Gabe, his best friend? He's started doing all sorts of freaky things that make Kellen question who he really is. Kellen and Calienta will fight to stay together and keep the hidden part of the prophecy from becoming reality. When the ultimate power is within reach, which side will he choose?