During the siege of Leningrad a Nazi bombshell destroys the storage of an experimental medicine institute where deadly dangerous viruses were kept. Severe winter weather prevents an epidemic from breaking out in the besieged city. But the spring is coming, and Leningrad is on the brink of bacterial catastrophe. Doctor Maritskaya and NKWD officer Andreew have only three days to save the city.
| Directing | Alexandr Kasatkin | Director |
| Writing | Arkady Vysotsky | Writer |
| Writing | Aleksandr Borodyanskiy | Writer |
| Production | Eduard Pichugin | Producer |
| Production | Irina Baskakova | Producer |