It's not that often a book you were forced to read on a lost bet becomes one of your favorites. I only read the first novel, but I was laughing all the way! The book was girly and angsty, but with the twist that main characters go to a school for spies. That premise, even if it isn't the most interesting, is certainly original (well, not exactly).
It's been a few years so I remember little of the plot or anything else, and I don't have a hard copy on me to refresh my mimd. All I remember was that it was an overall positive experience.