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. : )

The whole book was spytastic! Bertie, his dog Little Roo, and his friends Eleanor and David have to solve a cipher notebook. They know who owned it, Violette. They have to figure her trap out, to stop a double agent spilling the biggest secret of all to the Nazis. It is an amazing mystery novel about the World War II London. I'd recommend it to any mystery novel bookworm. ;)