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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

143 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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sooooooooooooo good 🤣

Review by SweetiePye

5 stars get this book!

Mar 15, 2026 04:13 PM
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Great

Review by Voogle

I like how it teaches you about different types I codes and that is really cool. I've always found the idea of being a spy interesting and this book really shows you how a boy became a spy in WWII. It is a really awesome book with twists and turns. I recommend this to everyone especially people who like solving mysteries!🔍

Mar 04, 2026 09:40 PM
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Exciting and unexpected

Review by DavidM

We really enjoyed this book. It was a fun one for both the adults and kids. Decoding the ciphers was really fun!

Mar 01, 2026 03:12 PM
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The WWII adventure book

Review by AdamA

How I Became a Spy is a great WWII book filled with adventure and secrets, stopping you at each chapter to solve a riddle. A great book that keeps you on your toes, making you want to skip through the book to know what happens next. Overall a incredible book.

Feb 04, 2026 08:27 PM
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I recommend this book

Review by TJT2016

It was awesome and amazing! I really liked it because it was about spies and I really like spies!

Feb 02, 2026 01:27 PM