The Keeper (Cal Hooper #3) by Tana French
For fans of Irish settings, literary crime novels, and completed trilogies!
Retired American detective Cal Hooper is divorced and a father to an adult daughter. He’s recently built a quiet life for himself in a remote village in rural Ireland, where he’s made ties with locals and also regularly found himself dealing with criminals. Now a young woman’s murder threatens the town and Cal’s relationships, thanks to a long-standing feud.
If you want to start at the beginning of this great trilogy, pick up
The Searcher.