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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

122 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

Video review by Jordan

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How I Became a Spy by Jordan

Reader Reviews

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How I became a spy

Review by PopsterLobster

It was scary.

Sep 10, 2025 09:00 PM
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How I became a spy

Review by Ss92615

Very detailed and exciting story!

Sep 10, 2025 01:43 PM
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My review

Review by AdamA

I loved the book! It's an amazing book of adventure, mystery and code-breaking. Personally, I found that the book had a lot of action and a big plot twist. Overall experience: I loved it! Great book

Sep 08, 2025 07:50 PM
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No

Review by MAGNOLIAMISS

I don't like it very much because it was scary😐

Sep 05, 2025 08:22 AM
kid avatar

nooooooooooooooooooo

Review by Djaharon

it was nooooooooooooooooooo its zero stars

Sep 04, 2025 04:48 PM