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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

129 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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How I became a spy

Review by AshSlem

BEST BOOK EVER😃😃😃 This book has a lot of surprises and suspense, so if you’re into that kind of stuff you definitely need to read this book.

Nov 02, 2025 06:35 PM
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How I Became a Spy

Review by Anassimi

This is about a 13 year old boy who meets a girl in England during WWII. It has many tragic accidents and it has many sad parts. I like books about spies so this was a great book for me.

Oct 20, 2025 10:10 AM
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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
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🙂🙂🙂🙂🙂🙂🙂🙂🙂🙂

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