| Three naval cadets accidentally get possession of a secret diary that was stolen from Bestuzhev, a vice-chancellor of Russia. If this diary ever gets abroad, the consequences for the country would be grave. The cadets are trying to return the papers to their owner, but there are others who want to get the papers... |
| Name | Character | Episodes |
|---|---|---|
| Aleksandr Pashutin | Yakovlev | 4 |
| Valeriy Afanasyev | Pavel Yagupov | 4 |
| Innokentiy Smoktunovskiy | kardinal Fleri | 4 |
| Igor Yasulovich | Korn | 4 |
| Rimma Markova | matushka Leonidiya | 4 |
| Viktor Pavlov | Kotov | 4 |
| Aleksandr Abdulov | Vasiliy Fyodorovich Lyadashchev - graf | 4 |
| Semyon Farada | Direktor navigatsionnoy shkoly | 4 |
| Nelli Pshyonnaya | Anna Gavrilovna Bestuzheva | 4 |