For about five more days (it's currently 9 pm, Sept 7, US Pacific time), the four books in the Jacob Burns mystery series by Matt Witten are on sale again as Kindle Countdown deals/free in the Amazon US store.
Link is:
http://www.amazon.com/Matt-Witten/e/B00AG1DXKW/
Right now three of them (
The Killing Bee,
Strange Bedfellows,
Breakfast at Madeline's) are $0.99 and the other one (
Grand Delusion, the second in the series) is free. Not quite sure why you would make the second one free, but WTH...
These were Kindle Countdown deals/free back in July, with a different one as the freebie, but if you missed them then, here's a second chance.
This series was published in DTB by Signet a while back, and I remember reading a couple of them and enjoying them.