The Hunter
by Tana French
The Hunter by Tana French is the second book featuring Cal Hooper, a Chicago cop who has retired to the Irish countryside (the first book was The Searcher, which you will need to read first). This is an extremely slow-burn mystery, as much about the relationships between various characters in a small Irish village as it is about the crime that gets committed. The audiobook, narrated by Roger Clarke, is superb. The plot of The Hunter revolves around an Englishman who comes to the village, apparently on a quest for gold he heard about from an elderly relation.