Policewoman Helena Rus (Malgorzata Kozuchowska) suspects that they are the work of the same man. When Helena's police partner, Bronson (Tomasz Oswiecinski) is seriously injured during the intervention, she decides to identify the murderer at any price. Along with the profiler from the Central Bureau of Investigation, Iwona Bogacka (Daria Widawska), who is delegated to this case, she conducts an investigation, which grounds must be sought in the 18th century history of the city. The women try to win the race against time and prevent further crimes.