Injustice for All is the second title in the J. P. Beaumont series by J. A. Jance. It has dropped to $3.99 at Kindle and Kobo US. This is a bit too pricey for me to replace my perfectly good DTB, but if you don't have the book already you may want to purchase - Jance's titles don't go on sale for much less than this very often (or very often at all).
Kindle US:
https://www.amazon.com/Injustice-All...dp/B000FC1TBC/
Kobo US:
https://www.kobo.com/us/en/ebook/injustice-for-all