The body of a young woman is washed up on the beach in Tri-City. The unusual trauma on the victim suggests that it is a murder. The investigation is led by the ambitious and indomitable prosecutor Leopold Bilski (played by Jakob Galsoo), and the victim's mother and Judge Helena Bogucka (played by Maya Ostazeska) also participate in the investigation. All clues point to a seaside nightclub, which is inextricably linked to a female murder 15 years ago. The information collected from the investigation and the evidence that has been covered up for many years gradually unveiled the dark veil of crime in Tri-City. Bilski and Bogucka's discoveries began to make the local police feel very difficult.