This book is full of mystery and suspense but when it all comes together at the end it all makes sense. Charlie is a child supergenius who is the only one smart enough to deduce where Einstein hid an equation that could save the world... or destroy. Charlie and the CIA have to find the equation before a group of terrorists, the Furies do...

This book is so good I can not explain it in words. Seriously...read it it is so worth it!

This book was so interesting, so intense, and just so awesome! There are a few violent parts, but overall it's one of the best books I've read! I highly recommend this book! I also am not so into action and all that, but this book was the best!

I Love this book! Anything by Stuart Gibbs is great and totally recommended. I am so glad that he involved Israel in this book so I could get it. I can't wait for book #2!!!!!! And the Spy School movie.

This book is soooo great! I could read it over and over. An absolute must read!