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 has spent the evening in the attic, training her pet mouse, Mrs Maple-Syrup – an unusually intelligent mouse, in Cecily’s opinion – when her parents disappear.

Luckily, Cecily is more than ready to investigate such a thing. She has wanted to be a spy her whole life, and has all the spy handbooks, manuals and code-cracking kits a girl could need.

But soon, Cecily discovers several very strange things in her city. She’s not the only spy out there – far from it, in fact. And Mrs Maple-Syrup is not the only unusually intelligent mouse…

'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)

Praise for EINSTEIN THE PENGUIN:

‘Funny, intriguing and utterly heart-warming … Wonderful’ Booktrust

‘A delight’ Sunday Times

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.

David Tazzyman is an internationally acclaimed award-winning illustrator.