Cruel Intent is the 4th in the Ali Reynolds series by J.A. Jance. It has dropped to $1.99 at Kindle and Kobo US. Note this title also appears in a box set of Ali Reynolds titles so check carefully before buying...
Kindle US:
https://www.amazon.com/Cruel-Intent-...dp/B0017SYOHY/
Kobo US:
https://www.kobo.com/us/en/ebook/cruel-intent