a surprising theme

This is the third novel by Fred Vargas and I am reading at the moment, I feel that the plot is still slowing amid books take better towards the end. A good start, good end, but in the center, I miss ...
In short, "the man in reverse" is interesting with this original plot, slaughtered sheep in the Mercantour and then it was the turn of a woman to be slaughtered, and there is the drama, Is it a wolf or a werewolf or a man who runs a wolf? The originality of the plot is there. Unfortunately, the survey is conducted by annoying characters for my taste, except Camilla, the beloved Commissioner Adamsberg. The latter is present in this novel and discovers the many features of his character, which is quite pleasant. By cons, we have to wait 2/3 of the book to see go on stage and Jean-Baptiste Adamsberg that, it is a bit long because it quite spices up our investigations commissioner. Anyway he finally arrived and then it is pure Vargas. When the denouement, I had a doubt before the end but it's still a good suspense. To read.