Author: Rangeley, Iona Reading age: from c 8 yearsPublished on 19 June 2025 by HarperCollins Publishers (HarperCollins) in the United Kingdom.Paperback | 240 pages128 x 198 x 19 | 214g 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…
