Agreed with LoveGravy. I heard all the buzz and friends of mine kept recommending it but I didn't listen, in an attempt at anti-hype. I went on vacation this winter and during some downtime had nothing to do and the first book was laying around so I picked it up. Had to finish it in that sitting. Read the next 3 over the course of the week.

They are getting darker and more complexly political. In that sense, I think they are becoming more "adult" than "kids."