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I don't get why Vincent has arrived to support Marc at this time...hard on the heels of this murder, having not seen his son for years, he pops out of the blue to 'support' him. There could be more going on here but I need more info to work it out.
I'm unsure what to make of the cryptic writing on the base of the carvings found by Morin in the cabin and the 'woe' sign in the spider web, unusual place to put a warning, if thats what it was meant to be. This man has been part of some trauma that happened a long time ago that resulted in a monumental departure of some sort in his personal life.
Olivier is cagey when Gamache confronts him with the findings of his fingerprints, Olivier doesn't 'know anything', which is hard to believe after all the time he has obviously spent with the man. I'm unsure about Olivier, perhaps the money business he was tied up with earlier in his career has some bearing on the hermit and all the money lying around the cabin and all the valuable items.
Do the Parras have anything to do with this - not much known about them yet.
I'm betting there is a tie up with the Hermit and someone in Three pines who has known him (and whom he may have 'wronged') in a previous life somewhere. I'm thinking the Parras are connected to this somehow, Roar Parra was clearing trails to the Hermit's cabin - others must have known he lived there besides Olivier. But then Gamache is not 100 percent sure Olivier is telling the truth either. Onwards.

I thought Peter had mellowed more in this book, he seemed softer at the beginning, not really surprised when he did this though, he always needs to kick back at Clara's talent.