The Mathematical Mysteries are a series of humorous thrillers with a slight mathematical tinge published by the very excellent Farrago Books. They are loosely connected, although each one can be read as a standalone adventure. I’d obviously advise starting at the beginning and reading right through to the end, because that way you’ll appreciate the overall story arc so much better. Also, I’ll make more money that way.
As an added bonus, if you read these books you’ll get to find out what Vavasorology is all about. This will put you one up on this bunch, who really haven’t a clue, bless them:
The titles are as follows:
The Truth About Archie and Pye (October 2018)
A Question of Trust (April 2019)
The Riddle of the Fractal Monks (April 2022)
Look at those covers (by the brilliant Mark Swan aka kid-ethic), and tell me they’re not massively collectable.