History teacher Nikolay Echevin on his sixtieth birthday receives an anonymous letter in which he is called the "center of public infection" and threatened with murder.
| Crew | Vadim Derbenyov | Script |
| Sound | Vladimir Chernyshyov | Music |
| Camera | Oleg Martynov | Director of Photography |
| Directing | Vadim Derbenyov | Director |
| Writing | Vladimir Tendryakov | Story |
| Crew | Anatoli Gorlo | Script |
| Crew | Natalya Asmolova | Script |