Original French title for this film is "La prochaine fois je viserai le coeur". It is based upon the real events that took place in 1978 - 79 in Oise County in France. A serial killer just starts killing young women and dumping their bodies. He then sends taunting letters to both the Police and their Gendarme cousins (separate departments). That is when the hunt is on. We know from pretty early on who the culprit is and so this is more of an examination of who this man was and what were his motives as well as a recreation of what took place.
The film plays out in a linear fashion with no back story and the makers have said they have had to use a lot of imagination and even supposition to fill those blanks in. So it is a work of fiction. Guillaume Canet ('Tell No-one') as the exemplar Gendarme with sociological issues is both chilling and convincing. The period detail is rather good but the eagle eyed amongst you will spot the same cars being used in different scenes (keep an eye out for a Triumph Herald) and as plot goes this does not hang about. As all thrillers need to be it is fast paced, there is an air of tension and the violence is both effective and at the same time done in an understated way.
All in all a very good French film - the subs could have been better - but that is generally the case these days. That said even at 111 minutes this felt like a much shorter film and as such it is one I would recommend.