There is a seven-year war, Russian soldiers are forced to fight for the interests of France and Austria against Prussia. The midshipmen continue to selflessly serve the Motherland. One is on an expedition, the other is at court, and the third is sent to Venice to hand over a jewelry box. In fact, there is a message in the box, on which the future fate of Europe and Russia depends!

Dmitriy Kharatyanas Aleksey Korsak
Mikhail Mamayevas Nikita Olenev
Alexandr Domogarovas Pavel Gorin
Viktor Rakovas Kristian fon Brockdorff - baron
Natalya Gundarevaas Elizaveta Petrovna - imperatritsa Rossii
Lyudmila Gurchenkoas Ioganna
Kristina Orbakayteas printsessa Fike - budushchaya Ekaterina II
Barbara Rudnikas Khristina - koroleva Prussii
Natja Jamaanas Petra
Evgeniy Evstigneevas Aleksey Petrovich Bestuzhev
Anatoliy Mukasey