Graduate students in the Historical Museum find a diary dated 1919. In the diary, the author confesses to the murder of five people. The terrible deeds of the past are the key to unraveling a number of crimes committed in our day.

Russia is at the dawn of great changes and the fate of a young man, Pyotr Cherkasov, who was forced to sacrifice his personal happiness to save the Motherland. In the center of events are bright and interesting characters, whose personal life history is woven into the history of European life. The interweaving of love lines, betrayal, jealousy, intrigue, exposing the enemies of Russia and the world order. Napoleon Bonaparte hatches plans to take over all of Europe. One of the most terrible wars in national history is approaching. In the meantime, the Russian people live in peace and ignorance. With the arrival of Prince Kuragin, the life of Peter changes forever. Emperor Paul I needs the best people to help Russia unravel Napoleon's insidious plans, and Kuragin, seeing Cherkasov's talents, invites him to go to St. Petersburg for military service. Cherkasov agrees, and now his life belongs to the Motherland.