Maximum Ride: School's Out - Forever, by James Patterson
The second book in this series by James Patterson. The second one picks up pretty much exactly where the first one left off, which is a great way to get you to buy the next book, I have to say!
There's a lot more of the conspiracy and destiny stuff in this one. What I said about the first one holds for this as well. It's fun light reading.
Really the only thing that bugged me was the Ari character. I know, these are kids with wings, I shouldn't expect reality, but the Ari stuff really rang false to me.