A great reckoning, by Louise Penny

Chief Inspector Gamache and his wife Reine-Marie are still happily living in the remote off-the-map village of Three Pines, somewhere in Canada near the Vermont border.  But he is now fully come back out of retirement. Having taken much of the rot out of the Sûreté du Québec in the previoius book, he has now accepted the position of head of the police academy and commutes back and forth to Montreal.  For it is in the academy that the rot begins, as new cadets learn the corrupt ways of their elders and teachers.  The plot revolves in part around an old map found in the walls of the town’s bistro, and the identity of both the mapmaker and the figures in the stained glass window in the local church that was dedicated to the fallen sons of the village in The Great War.  Up to Penny’s usual high standard.  592 pp.