The film takes place in Europe in the 19th century. The film shows the popular uprisings that took place there, as well as the search for truth and the confrontation of Karl Marx and opponents of the revolution.

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.

A man's corpse is found on the seashore. Conducting a thorough investigation, the young investigator Kovalev establishes the identity of the murdered man and his pursuer - in the past a provocateur, who gave the Hitlerites a group of underground fighters. At one of the interrogations the criminal recognizes in the prosecutor Skurchikhin former SS Oberleutnant and begins to blackmail him, not suspecting that he worked for the Soviet intelligence...

The Soviet boys, Vadik and Yura, together with the mischievous little girl Tosha, are children with a kind heart and good life philosophy. One day they find money on the street, which must be returned to the owner without fail. But where to find an inattentive citizen who has lost not only money, but also a booklet with quite important information. So, begins the time of exciting adventures, breathtaking moments, high-quality humor and instructive-entertaining ideological line.

In June 1941, the Extraordinary Defense Headquarters of Leningrad, under the leadership of Zhdanov and Voroshilov, decided to build the Luga defensive line. Heavy fighting west of Pskov forced units of the front to withdraw, and on July 9, Pskov was also abandoned. The battles in the Luga direction held back the enemy. The first attacks of the Germans, intending to cross the Luga line on the move, were repulsed with heavy losses for them.

A tale based on a classic novel by Alexander Pushkin.