Originally published in 2012, translated to English in 2014, Death in Brittany is the first novel of Commissaire Dupin. The author writes these stories pseudonymonously and is said to split his time between Germany and Brittany, but is obviously deeply familiar with Brittany.
Death in Brittany, by “Jean-Luc Bannalec”; 318 pages; published 2012, trans. Sorcha McDonagh 2014
Murder on Brittany Shores; 380 pages; published 2013, trans. Sorcha McDonagh 2016