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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

127 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

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kid avatar

A great book

Review by Levi1303

I love the book because I love spying and the book is about spying.

Oct 05, 2025 02:55 PM
kid avatar

🙂🙂🙂🙂🙂🙂🙂🙂🙂🙂

Review by Moosey123

😍😍😍🙂🙂🙃😌

Oct 03, 2025 08:27 AM
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How i became a spy

Review by Africanwilddog786

Super duper cool 😎

Oct 02, 2025 06:28 AM
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Really good book. You'll love it

Review by Ateam11

Told the story of a kid in London during WWII who helped people in the Blitz. It's an amazing story with lots of action. It's a great book.

Oct 01, 2025 08:57 PM
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How I became a 🕵️‍♂️

Review by efeldor

Amazing and exciting

Oct 01, 2025 04:33 PM