A rule against murder(2009) by Louise Penny

Thanks once again to Goodreads for this image and summary.

It is the height of summer, and Armand and Reine-Marie Gamache are celebrating their wedding anniversary at Manoir Bellechasse, an isolated, luxurious inn not far from the village of Three Pines. But they're not alone. The Finney family -- rich, cultured, and respectable -- has also arrived for a celebration of their own.
The beautiful Manoir Bellechasse might be surrounded by nature, but there is something unnatural looming. As the heat rises and the humidity closes in, some surprising guests turn up at the family reunion, and a terrible summer storm leaves behind a dead body. It is up to Chief Inspector Gamache to unearth secrets long buried and hatreds hidden behind polite smiles. The chase takes him to Three Pines, into the dark corners of his own life, and finally to a harrowing climax.  

PS  Peter of "Peter and Clara" of Three Pines belongs to The Finney Family. Umm.

Bury your dead (2010) by Louise Penny

It is Winter Carnival in Quebec City, bitterly cold and surpassingly beautiful. Chief Inspector Armand Gamache has come not to join the revels but to recover from an investigation gone hauntingly wrong. But violent death is inescapable, even in the apparent sanctuary of the Literary and Historical Society— where an obsessive historian’s quest for the remains of the founder It is Winter Carnival in Quebec City, bitterly cold and surpassingly beautiful. Chief Inspector Armand Gamache has come not to join the revels but to recover from an investigation gone hauntingly wrong. But violent death is inescapable, even in the apparent sanctuary of the Literary and Historical Society— where an obsessive historian’s quest for the remains of the founder of Quebec, Samuel de Champlain, ends in murder. Could a secret buried with Champlain for nearly 400 years be so dreadful that someone would kill to protect it?

Although he is supposed to be on leave, Gamache cannot walk away from a crime that threatens to ignite long-smouldering tensions between the English and the French. Meanwhile, he is receiving disquieting letters from the village of Three Pines, where beloved Bistro owner Olivier was recently convicted of murder. ‘It doesn't make sense,’ Olivier’s partner writes every day. ‘He didn't do it, you know.’ As past and present collide in this astonishing novel, Gamache must relive the terrible event of his own past before he can bury his dead.  

Thanks to Goodreads for image and summary.  Goodreads continues to be a source of quick summaries and publication info.