The young soldier Vasily Lemekhov has returned from the hospital and met a young woman Natasha in Chisinau.

British MP Sir Robert Chiltern is known for his honesty and integrity. To match his wife, Lady Chiltern, who is an example of high morality. However, the past of Sir Robert, as it turned out, is not at all perfect. Famous socialite adventurer Laura Cheveley, with evidence of his long-standing dishonorable act, is trying to blackmail Chiltern. Not only Sir Robert's reputation and career are at stake, but also family happiness. His best friend comes to the rescue — Lord Goring.

The film tells about the childhood and youth of the wife, friend and military ally of the founder of the country of the Soviets Nadezhda Konstantinovna Krupskaya. The main attention in the film is paid to the participation of a young revolutionary in the organization of the struggle of the workers of St. Petersburg for their rights, against the autocracy.