Pyatnitsky is a spin-off of a super popular TV series «Cold Case». The action takes place in the same department with some characters already familiar to the audience. Lieutenant Colonel Zimina passed the re-certification and decided to finally get things sorted out in her department. From now on Pyatnitsky Department under her leadership is going to have the following team to tackle crime: a new Head of the Interrogation Office, involved in a romantic relationship with one of the agents, a roguish district police officer, two patrolmen, a chief of Public Security Police, a juvenile officer, a trio of clever detectives and even the District Police Chief - General Zakharov.