I loved this book. It was a very adventurous book. I really like Stuart Gibbs book. Great book!

Omg, my head was glued into this book! Ar first, I wasn't so sure about this book, and then I was more than sure! If you like an intense, powerful book that is always keeping you on your feet as a reader, than this book is definitely for you! Every time I thought that Charlie and the CIA were going to catch a break, they ran right into trouble!!!! I HIGHLY RECOMMEND THIS BOOK TO EVERYONE!!!!!!!

his book was so awsome! i wish i could give it more then 5 stars! its one of the best books iv'e ever read! i learned alot about albert einstein. it was soooooooo fun to read, i couldnt put it down! it was full of adventure, not even mentioning that charlie is a complete genius who does advanced calculus problems for fun! oh yeah she's also only 12 years old. she does things so crazy that they blow your mind! especially when the c.i.a. gets involved. its hard to write a review without spoiling it by saying all the awesome hings that happen!

I liked how it had an adventure where you really didn't know what was going to happen unlike some books. But it wasn't all unknown because you could tell different sides of the story.