This is my favourite Louise Penny book! While interesting at first, I found it tedious in her other books to be spending so much time in Three Pines with all of its 'colourful' characters. I particularly got tired of reading page after page about how the gang regularly meets in the bistro to gorge themselves.
In setting the book in Paris and shaking off Three Pines (for the moment), I think Louise Penny has written her best Gamache novel so far. Particularly enjoyable was how she brought the whole Gamache family together in this book, so you can really see the interplay between the family members.
And, as a mystery, it's great. She keeps matters vague enough so you are wondering, page after page, who to trust. A great ending!