This is a 2 part miniseries, about serial murder on brunette women in the 70's in Poitou-Charentes region. Anne Ketal investigates, with the help of her partner Mathias, who has recently arrives from other region. The victims are found with open belly and a dead crow nearby. As usual when horrific things happen in a small town, the inhabitants begin to suspect each other.
The police force is in a poor condition. With such a big case, it seems only Anne is working on it. Mathias is more interested in building a relationship with her than catching the murderer. When her friend calls Anne after receiving a dead crow and believes she is the next target, Anne calls some police to go to her house. As there is no patrol car, they go by bike - and has a flat tire. When they arrive, the girl has been dead.
Realizing that the killer only targets brunette women, the beauty salon is flooded with those who want to dye their hair blonde.
The conclusion is somewhat disappointing. The sympathetic Mathias turns out to be the culprit. OK, he has been abandoned by his mother and abused by his foster mother. "Do you realize that the women you killed have nothing to do with this?" asks Anne. "That is why you have to kill me now to stop this." he answers. I hope he could come with a better line.