Salt River is the 26th and most recent (2020) in the Doc Ford series by Randy Wayne White. It is $1.99 today as part of the US Kindle Daily Deal, matched at Kobo US.
Kindle US:
https://www.amazon.com/dp/B07T8THFKT/
Kindle US/Smile:
https://smile.amazon.com/dp/B07T8THFKT/
Kobo US:
https://www.kobo.com/us/en/ebook/salt-river-5