Joffe's free book this Friday/weekend is
A Body on the Flats, which I am very late in posting, so is probably only good for a few more hours. It's the first in the Kane and Granger series by Max Manning.
Kindle US:
https://www.amazon.com/dp/B0DCW4CLC2
Kindle UK:
https://www.amazon.co.uk/dp/B0DCW4CLC2