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...

• Gosteleradio USSR
• Mosfilm
• Sergey Zhigunov
• Dmitriy Kharatyan
• Vladimir Shevelkov
• Tatyana Lyutaeva
• Mikhail Boyarskiy
• Evgeniy Evstigneev
• Vladislav Strzhelchik
• Olga Mashnaya