On the day of a brilliant dissertation defense, a young scientist unexpectedly dies. Investigation of the facts indicates an accident. However, the discrepancy in the testimonies of colleagues leads the investigator to think about the uncleanness of the hero, who simply used the unpublished results of other people's work.
| Actor | Role |
|---|---|
 Andrey MyagkovAnton Dmitrievich Tikhomirov (young scientist) | Anton Dmitrievich Tikhomirov (young scientist) |
 Anatoliy PapanovIgor Mazin (investigator) | Igor Mazin (investigator) |
 Irina MiroshnichenkoInna Krotova (former lover) | Inna Krotova (former lover) |
 Vladimir ZeldinDiaghilev (professor and supervisor of Anton Tikhomirov) | Diaghilev (professor and supervisor of Anton Tikhomirov) |
 Zhanna ProkhorenkoIrina Tikhomirova (ex-wife) | Irina Tikhomirova (ex-wife) |
 Albert FilozovIlya Rozhdestvensky (childhood friend and colleague) | Ilya Rozhdestvensky (childhood friend and colleague) |
 Irina ReznikovaSvetlana Meshkova (fiancee of Anton Tikhomirov) | Svetlana Meshkova (fiancee of Anton Tikhomirov) |