One of the later Secret Seven adventures, Secret Seven Mystery gives Blyton’s school-holiday detective club exactly what it needs.

Of course; a suspicious place, a half-seen adult world, and children who insist on poking their noses where they probably shouldn’t. We go through sheds, stables, whispers, bicycles, codes, sandwiches, all with that deeply British conviction that a mystery can be solved if you keep your eyes open and don’t act like an idiot. Vintage junior sleuthing with all the briskness and accidental oddness that makes these books endure.

First edition Brockhampton hardcover with the blue pictorial boards and internal illustrations. Missing dust jacket, in good condition.