I recommend this book to people who like city spies. I love it because you can't put it down. If you don't like book with big action fighting scenes, this book isn't for you.Overall awesome.

So good

This is an AMAZING book! You cant put it down and i totally reccomend reading the other books in the series!!!!!!

This was such an amazing book! I loved how it was about a teenage girl who is sassy and a genius. I just learned there is more books in the series and can't wait to read them. The plot moved fast and I spent many late nights reading it. Would totally recommend!

I COULD NOT put this book down! This is so amazing and fast-paced, and I loved how Charlie is still a sassy teenager even when she is smart. This book is actually in a series, and I immediately looked for and read the other two (number 3 is on hold!) books.