Audrey Fleurot, whom I saw in Engrenages and Un village français, plays a police detective named Joana Larsen here. I believe men will find her hot, especially for her red hair :-) Joana Larsen is a very independent woman and Fleurot is perfect in this role. Her co-star, Frédéric Pierrot, is also very good in playing a police detective who has divorced and is taking care of his only son, who often blackmails him to get things he wants, like the newest game, for example. Thierry Sauvage (that's his name) has been having relationship with another woman and she is pregnant now. It's not official yet because he still lives with his son only. One time he irons his pants in the headquarters. In one occasion his son sees the dead body in the autopsy room.
Together Larsen and Sauvage try to solve murders of 3 women who live alone with their dog. The victims found the dogs in the street about 2 months before. It seems that the 'timid' dogs are the killer. The investigation leads the 2 detectives to an old case of 20 years ago, where one of the victims, still a high school student, accused her teacher of rape. 3 other girls were witnesses. The teacher committed suicide and it seems now that the murders are an act of revenge. Something has triggered the dogs so that they become ferocious and attack the women. The detectives must find the 4th woman before it is too late. Meanwhile, the killer sends a killer dog to Sauvage's son, who blackmails his mother so that he can keep the dog.