I liked this book because I like all spy and CIA agent books. This book taught me more about Israel because they had to go to Israel (Jerusalem) to find a clue and I learned a lot about Jerusalem while I was reading. The coolest thing I learned was that its walls were really old.

It was so good! I never wanted to put it down. There were so many cliffhangers and plot twists!

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Throughout the book there is action, mystery, crazy equations, super awesome Einstien facts, surprises, smarts, and silly jokes!!! Half of the the time you are on your toes to see what Charlie does next then You are completely surprised about all of the characters choices! These characters are also completely believable and make bad choices.... which is a perfect thing for a novel like this to have! This is a great book - and also quite unique - and I wholeheartedly recommend!

This was awesome i can not put it down super good plot one of the best books i ever read lots of twists and turns i have read soooooooooo many books this one caught my attention and i could not put it down till the end. PJ library is setting the bar for them selfs this book is hard to beat.