Equipped with a strong temperament, Commissioner Martine Monteil is the first woman appointed to head the prestigious Criminal Brigade. Deeply affected by the murder of a victim of the “East Paris Killer,” she has made it her top priority to hunt down this dangerous psychopath. Despite her determination to advance the investigation, she is often forced to use methods that are not always appreciated by her superiors. To maximize her chances, she works to collaborate with sometimes rival services. Her goal: to establish a DNA fingerprint database to identify Guy Georges. However, Monteil also has to fight against the prejudices of her colleagues and their sexist behavior…