There are only a couple more days for this month's Amazon Prime "First Reads", but there are a few that look interesting, if you haven't already picked:
Malibu Burning, Sharpe & Walker #1, by Lee Goldberg, I've read a couple of his other books, and they were pretty good, if a bit thrillerish:
https://www.amazon.com/dp/B0B2P7PWDD
Redemption, Eva "Lightning Dance" Duran #1, by Deborah J Ledford, characterized as a police procedural:
https://www.amazon.com/dp/B0BM1VNFP9
Salthouse Place, by Jamie Lee Sogn, suspense:
https://www.amazon.com/dp/B0BQWWY7W9
The Shallows, by Holly Craig, domestic suspense:
https://www.amazon.com/dp/B0B95FT319