Meredith Ann PierceBy
The Darkangel, a vampire of astounding beauty and youth, can only summon his full power when he finds his 14th and final bride. But for Aeriel, whom he kidnaps to serve his brides, there is something about him--something beyond his obvious evil--that makes her want to save him rather than destroy him. The Darkangel--Pierce's first book, originally released in 1982--was an ALA Best Book for Young Adults, a New York Times Notable Children's Book, a Parent's Choice Award Superbook, and a Booklist Best Book of the Decade.
That is a seriously lousy description, but I can't find anything better. But, you get the idea. The tale itself has been around for a while, but what got me to pick it up was the blurb by L'Engle :) It was a fast read, and really quite interesting. I was a bit confused for the first half with some of the rather odd details about the world, but they finally fit into place. On the whole, it was an intriguing fantasy. There are two sequels, which I will have to check out when I get some time!