I would probably say 3.5 stars, to be honest. 
 This book was easy to read and kind of sweet. I liked Liz, and Bex, and Josh, and especially Macey. 
 I did not like Cammie. Part of it was probably Carter herself bleeding through into her story, but damn was Cammie an annoying character. I think the bit that annoyed me most was: "Yeah, right. Snobbery is a quality, so is elitism, fascism, and anorexicism." Like, okay, Cammie, genius. If you were such a genius as you always seem to be going on about, you would know that this so called 'anorexicism' (which isn't a word, genius) is a fucking mental illness and not just a quirky sarcastic thing to add to the end of an insult. And this whole sentence is actually badly thought out and offensive of Carter. Also, 'anorexicism' is in no way as bad as snobbery and elitism, which in turn are not as bad as fascism. And, fascism? Where did that even come from? There was absolutely no indication of Macey being a fascist and Our Genius Cammie should know better than to just throw these political words around, in my humble idiot opinion. 
 Cammie our resident genius is also not really one to moan about elitism and snobbery. Every single page, dropping a name of someone who was in the Gallagher Academy, or talking about some Extremely Important Thing that someone at this academy had done. Brilliant! I don't really care though, and it does get annoying! Also, how she is Not Like 'Normal' Girls was also very annoying. Well done Cammie! You and your friends are Different(tm)! Highlighting how you can't tell anyone, how much of a Chameleon you are and blah, okay. Tone it down and get. on. with. the. story! 
 Also the fact that this ultra brilliant and top secret spy training school did not teach these girls about boys seems totally unrealistic to me. Like, the way Cammie reacts around the first boy she properly meets, not to mention the way all the girls react to Hot Mr Solomen (or whatever his name is) totally shows that if they have not already, they should really introduce something about boys. Imagine! All these girls go out into the world to do these Top Secret Spy Missions and they all get compromised. Because in the real world... BOYS... even better.... MEN! 
 Other than that, I thought the bits with Cammie and Josh were nice, and I wish that her little spy bits were more fleshed out because that was interesting! Though there were a few things I am not convinced about... for example... killing people with uncooked spaghetti? But yes! I felt bad for Josh a lot and in the end I am really hoping his mum gave him good, normal tea and not forgetful tea, or that he doesn't feel some inexplicable sense of loss. Good guy, Josh, trying to save Cammie, even though of course, to snob and elitism disliking elitist snob Cammie, you are just: "...a regular boy who had the misfortune of loving an exceptional girl." Hmm, tone it down and kind of get over yourself Cammie, the whole experience would be better then.