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...

Sergey Zhigunovas Aleksandr Belov
Dmitriy Kharatyanas Aleksei Korsak
Vladimir Shevelkovas Nikita Olenev
Tatyana Lyutaevaas Anastasiya Yaguzhinskaya
Olga Mashnayaas Sofya Zotova
Mikhail Boyarskiyas shevalye De Brilyi
Evgeniy Evstigneevas Aleksey Petrovich Bestuzhev
Vladislav Strzhelchikas Lestok
Aleksandr Abdulovas Vasiliy Fyodorovich Lyadashchev - graf
Innokentiy Smoktunovskiyas kardinal Fleri
Nina Sorotokina
Yuriy Nagibin
Svetlana Druzhinina
Viktor Lebedev