In 1917, the people of the Russian Empire are no longer willing to fight Germany, but the bourgeois government of Alexander Kerensky is unwilling to defy its imperialist allies and stop the war. Only Vladimir Lenin's Bolshevik Party is resolute in calling for peace. In the front, the soldiers of one battalion elect three delegates to travel to St. Petersburg with donations the troops collected for the Pravda newspaper: Gudushauri, Panasiuk and Ershov. The three arrive in the capital and describe the horrendous conditions in which the soldiers live to Joseph Stalin, Lenin's trusted aid and colleague. They join the Bolsheviks and take part in the storming of the Winter Palace, led by Stalin and Lenin. Stalin announces that the great dawn of revolution has broken.

The construction of the Kremenchuk hydroelectric power plant is in full swing, but the Dnieper may flood the construction site. In order to save people, the chief engineer Ilchenko decides to blow up the newly built dam... The workers do their best not to let this prevent them from delivering the HPP on schedule.