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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

94 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 would rate how i became a spy (recommended)

Review by MagicMew

I liked how the main character changed and adapted throughout the story. it has a very realistic point of view and could represent a real occurrence. overall it is a good book to learn about a jew in WWII

Jun 05, 2025 10:11 PM
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How I became a spy by mia

Review by verdeatx12

For people who love codes this book is for you

Jun 04, 2025 04:17 PM
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calling all codemasters

Review by Salvy

I definitely recommend it for those who like ciphers. In all, to find out who was the bad one was very interesting. If you guys like spies, WWII, Britain and ciphers, you're going to love this book!

Jun 04, 2025 01:22 PM
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How I Became a Spy

Review by ChiefToph

Love the book

Jun 03, 2025 03:17 PM
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An exciting historical mystery

Review by LTinuviel

If you like history and mystery, this is the perfect book for you. Bertie volunteers for the London civil defense in World War II, helping to warn people to go to a bomb shelter when an air raid is about to happen. One day while on duty he gets caught up in a drama that's bigger than him: a real-life spy story. Join him and his friends (including his wonderful dog Little Roo, who rescues people trapped under rubble after bombings) to unravel the mystery...and figure out who he can trust. The story also includes cipher systems used by spies and the French Resistance, so you can try your hand at secret communications.

Dec 29, 2024 08:41 PM