'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.