A thriller that contrasts

Murders of total barbarism, but seem to follow an implacable scenario. The small (in size) controlling Camille Verhoeven will launch at their own risk, in pursuit of the insane.
As in dress married Pierre Lemaitre place an original and catchy scenario.
As in the same book, he can not help but flaunt virtuosity in the plot which certainly catches, but can also irritate. Indeed, his characters are not believable, especially the commander dwarf. Moreover, the descriptions of murders, give a little nausea, even if the script makes consistent.
Finally, we expect a much unexpected ending that eventually, once one rejects all agreed assumptions, we can more or less find the solution to the puzzle.
After all these criticisms, let's principal: a wildly original screenplay and a good mastery of suspense that keeps you spellbound. It's not perfect, but it's highly recommended.