This book was awesome and very informative. I loved reading it and mom really enjoyed it as well.

I've read it twice! It's action-packed and leaves you hanging. I really enjoyed the spy-coding.

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I loved this book because of the ongoing mystery and plot twists. I love the spy elements as well as the imagination parts of it.

I love all mystery books! This one is thrilling. The suspects. The kids doing great things! I've always wanted to be a spy, and this helps me with my imagination! It even has Cipher code in it for you to learn, and many more fun twists to it. I highly recommend this book if you like mysteries, codes, spies, World War Two, or anything of the sort. : )