The Turing Tests Expert Number Puzzles

Simple cover design is inspired by 1940s wartime book covers.

The Alan Turing Puzzle Books series has sold over 140,000 copies.

Eric Saunders is a prolific writer of non-fiction for children and adults, specialising in puzzle and activity books. He has been compiling puzzles for over 35 years, and his work can be found in books, newspapers and websites around the world. He lives in Wales.

Dermot Turing graduated from King's College Cambridge and New College Oxford. He spent his career in the legal profession, most recently as a partner of Clifford Chance. Since 2014 he has moved into a more varied range of activities, including an active role as a trustee of Bletchley Park. Dermot Turing is the nephew of Alan Turing and author of Prof: Alan Turing Decoded (2015) and the well-received X,Y and Z: The Real Story of How Enigma Was Broken (2018).