Fallen. I shall admit I have only read this first one. I have the second one, Torment, but I have yet to read it sadly. Same as with Vampire Academy, it has been so long since I've read this that I'll need to re-read it to refresh my memory before continuing the series. Honestly the only things I am able to remember are that I was crazy about this book and the name Daniel. If I'm not mistaken there are a total of 5 books in this series (so far, I guess), right?