Three of the six books in Andrea Carter's Inishowen series have just dropped to $0.99 each at Kindle US. I have read ARCs of a couple of the books in the series and, as I've mentioned before, the mysteries seemed a bit bleak, but were puzzling enough. However, I thought Carter's ability to convey a sense of the remote Inishowen peninsula was even better. And, the other three books in the series are only $1.99 right now, so if you like the series, you can scarf them all for less than $10.
link to the series webpage at Kindle US:
https://www.amazon.com/dp/B0BVF6RFJQ...kindle_edition
link to the third book,
The Well of Ice, whose Kindle version doesn't show up on the series webpage for some reason:
https://www.amazon.com/dp/B086KXFB9M