If you enjoy Hut 33, and/or crosswords, you may enjoy a novel I've just written called Crossword Ends in Violence (5). It's a quintessentially British thriller about a professional crossword setter who discovers that his grandfather was accused of passing secrets to the Nazis just before D-Day. It's a comic spy novel - with a gulag and some chess grandmasters thrown in. It's like Robert Harris with jokes.
You can read long extracts of it here. And you can buy it here.