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Cecily Sawyer: How to Crack a Code

Series: Cecily Sawyer
Brief Description
The second thrilling, mysterious and very, very funny Cecily Sawyer mystery, from the award-winning author of Einstein the Penguin. Cecily Sawyer is surrounded by spies. They’re everywhere – on the streets, in her home, at her school – and after intercepting a highly suspicious message intended... Read More
Format: Paperback / softback
$1999
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Releases 29th September 2026 (Approx. Date) Pre-order  "Cecily Sawyer: How to Crack a Code" now to secure your copy from our first shipment

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The second thrilling, mysterious and very, very funny CECILY SAWYER mystery, from the award-winning author of EINSTEIN THE PENGUIN.

An Unputdownable and Whip-Smart Spy Mystery for Children

Book Hero Magic formatted this description to make it easier to read. While it's new and still learning, it may not be perfect - your feedback is welcome! Description

The second thrilling, mysterious and very, very funny Cecily Sawyer mystery, from the award-winning author of Einstein the Penguin.

Cecily Sawyer is surrounded by spies. They’re everywhere – on the streets, in her home, at her school – and after intercepting a highly suspicious message intended for her parents (also spies), Cecily, along with her highly-intelligent pet mouse, Mrs Maple Syrup, decides to investigate.

And the more that Cecily digs, the further the mystery deepens… forcing her to question who – if anyone – she can really trust.

Hugely gripping, incredibly funny, highly original, and brilliantly illustrated throughout by David Tazzyman, How to Crack a Code is an unputdownable mystery – perfect for fans of Robin Stevens and Katherine Woodfine.

Also available in the series:

Cecily Sawyer: How to be a Spy

Praise for Cecily Sawyer: How to be a Spy:

"With so many undercover agents vying for attention, the choice can seem daunting – but Cecily Sawyer: How to Be a Spy, a delightful new adventure by Iona Rangeley, shows the detective formula working at its best… Rangeley is a witty, beguiling writer – and what follows is a neatly plotted adventure, in which each clue forms part of a puzzle which the reader can piece together as the narrative rips along." – The Telegraph

"Whip smart, absolutely hilarious and full of charm." – Laura Noakes, author of Cosima Unfortunate Steals a Star

"A fabulous book" – Zohra Nabi, author of The Kingdom over the Sea

"A charming and elegant corrective to the notion that 10-year-old girls and mice have no role to play in espionage." – Luke Jennings, author of Killing Eve

"I firmly recommend this book. A very good start for those who want to join the profession or who just want a good read." – Sir John Scarlett, former Chief of MI6 (really)

Series: Cecily Sawyer

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  • Cecily Sawyer: How to Crack a Code
    Pre-order
    Cecily Sawyer: How to Crack a Code
    The second thrilling, mysterious and very, very funny Cecily Sawyer mystery, from the award-winning author of Einstein the Penguin. Cecily Sawyer is surrounded by spies. They’re everywhere – on the streets, in her home, at her school – and after intercepting a highly suspicious message intended for her parents (also spies), Cecily, along with her highly-intelligent pet mouse, Mrs Maple...
    Paperback
    $1999
    Pre-order
    Out 29 Sep 2026

Book Details

INFORMATION

ISBN: 9780008644482

Publisher: HarperCollins Publishers

Format: Paperback / softback

Date Published: 18 June 2026

Country: United Kingdom

Imprint: HarperCollins

Contributors:

  • Illustrated by David Tazzyman

Audience: Children

DIMENSIONS

Spine width: 20.0mm

Width: 129.0mm

Height: 198.0mm

Weight: 220g

Pages: 240

About the Author

Iona Rangeley grew up in Norfolk and studied English at Oxford, where she developed a love of children's books. She has wanted to be a writer since her debut novel, Sam and the Pig, which she wrote when she was five.

Also by Iona Rangeley

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  • The Case of the Fishy Detective
    An unforgettable friend returns in this warm and fantastically funny sequel to the bestselling debut Einstein the Penguin. Imogen and Arthur have been missing their friend, the penguin, Einstein, since he went back to Australia. So when an opportunity for him to return arises, they jump at the chance. But then Einstein and his friend Isaac are kidnapped. It’s time...
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  • Einstein the Penguin
    I love this book . . . Iona Rangeley has written a wonderfully witty story in Einstein the Penguin which is beautifully complemented by David Tazzyman's hilarious illustrations. - DAVID WALLIAMS, author of GANGSTA GRANNY An outstanding debut. Funny and surprising. - The Times Best Books for Children 2021 When the Stewarts spend a sunny, frosty December day at London...
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  • The Case of the Polar Poachers
    Einstein the penguin is back in this future-classic and fantastically funny story for all the family to enjoy. Get ready to welcome the most extraordinary penguin back into your own home. Imogen has been taking a step back from penguin activities since she started her new school, leaving her brother, Arthur, in charge of visiting their feathered friends. But when...
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  • Cecily Sawyer: How To Be a Spy
    A thrilling, mysterious and very, very funny new adventure from the award-winning author of Einstein the Penguin, with brilliant illustrations from bestseller David Tazzyman. Cecily Sawyer: How To Be a Spy takes you on an exciting journey with Cecily Sawyer, who has spent her evening in the attic, training her pet mouse, Mrs Maple Syrup – an unusually intelligent mouse,...
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  • Einstein the Penguin
    “I love this book . . . Iona Rangeley has written a wonderfully witty story in Einstein the Penguin which is beautifully complemented by David Tazzyman's hilarious illustrations” — DAVID WALLIAMS, author of GANGSTA GRANNY “An outstanding debut. Funny and surprising” — The Times Best Books for Children 2021 Perfect for all readers from 7 to 70, Einstein the Penguin...
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