Several of the titles in Robert Campbell's Jimmy Flannery series have recently been on US Kindle Countdown at $0.99, however, now one is FREE!
Thinning The Turkey Herd is the fourth in the series and it is free right now at Kindle US, no idea why or for how long.
link:
https://www.amazon.com/Thinning-Turk...dp/B015T56Q4E/
I should probably also note again that the first in the series,
The Junkyard Dog, is a long term freebie and is still free if you want to dip your toes in that one first. Info in this previous post:
https://www.mobileread.com/forums/sh....php?p=3459166