The Commissioner of Police has been tasked with conducting an investigation into the threat of a terrorist attack in the building of the press concern. During the investigation, he learns about the existence of the 31st department, created by the management of the concern with the aim of eliminating the opposition press.
| Directing | Yuri Aksenov | Director |
| Directing | Evgenya Kostenych | Director |
| Writing | Stella Zdanova | Writer |
| Writing | Per Wahlöö | Novel |
| Camera | Vladimir Gellerman | Director of Photography |
| Art | Gennady Dreyman | Production Design |