The action of the film begins in the Crimea in 1787. Representatives of the Western powers once again begin their intrigues against Russia, but the main characters, former midshipmen, who have already reached a respectable age by this time, and their adult children, stand up to defend their homeland. They have to sail to the Crimea from Malta and there take part in the war with Turkey; in particular, to take part in the battle of Kinburn under the command of Suvorov.

Taking advantage of his intellectual superiority, the teenager Valya Uspensky subtly and mercilessly takes revenge on others for small and big offenses. The young mathematics teacher Igor Aleksandrovich also falls into the field of his interests, whose intelligence and tact will properly influence the guy. But the young intellectual will suffer a crushing defeat in the seemingly ordinary everyday situation, which will be set up for him by his sweet, pretty classmate Ira - if only in order to once and for all teach the narcissistic jester a lesson.

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!

In the second movie the Naval Cadets are guarding the princess coming from Germany to marry a Russian prince.