The Searcher by Tana French

 Cal Hooper spent twenty-five years as a Chicago policeman.  After his wife decided she wanted a divorce, he decided it was time to retire.  But he didn't just retire and hang around Chicago.  Instead he bought a cottage in rural Ireland that needed repairs and moved across the ocean.

Cal's days are spent cleaning, roofing, stripping wallpaper and painting.  He makes friends with the neighbors, most of whom are older men who farm and have lived there their entire lives.  But there are still some young people.  One, Trey, starts coming by and soon is helping Cal with his work.  But Trey has an ulterior motive.  Trey wants Cal to find his older brother, Brenden, who disappeared six months ago.

Cal is reluctant to do so.  His best guess is that Brendan just decided to take off to try to find a better life in one of the cities.  But as he starts to look into it, it seems that Brendan may have gotten himself caught up in trouble with some of the local drug gangs.  It could be more serious.  

Most people know Tana French as the author of the Dublin Squad series.  This new series is set not in a city but in the country.  Cal knows nothing about the country or the life long relationships that exist and as he starts to uncover dark secrets, he wonders if he is putting everyone he knows into danger.  This book is recommended for mystery readers.