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Bertie and his dog stumble across a notebook in code on the streets of World War II London. Is the notebook’s owner a spy? Can Bertie and his friends crack the code before something terrible happens?  
Ages 10+
Pages 272
Publisher Penguin Random House
Last Offered Jun 2025

Average Rating

136 Reviews

Featured Reviews

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A great story!

Review by Hudson

How I Became a Spy is a great story about WW11 in London. It is also a great book if you want to learn about WW11 and codes and ciphers. You should read this book if you liked the book The Bicycle Spy.

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How I Became a Spy by Jordan

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How I Became a Spy by Jordan

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Quite a journey

Review by Bananakid

This is a different kind of mystery story - it's more about how you get to the end than who did it. There are real codes to break along the way, you learn to ask who can be trusted, and a small dog named LR who can save people from bombed out buildings if things get suss. It is cool to read about kids helping win a war and also sad to think about kids having to live through war.

Dec 09, 2025 05:45 PM
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great

Review by AvicadoG

its about a boy in. world war two

Dec 02, 2025 07:54 PM
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great book

Review by Zekebear

i love it

Nov 06, 2025 05:23 PM
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how I became a spy

Review by mayberkley

good book

Nov 04, 2025 06:19 PM
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Awesome book

Review by ViolinPrincess

It was really good and had lots of cliffhangers

Nov 03, 2025 09:24 PM