The Soviet steamer Bogatyr delivers construction materials and rafts with timber to the earthquake-stricken city of Marto. However, foreign intelligence is preparing a sabotage operation on the Bogatyr...

A young girl gets a job at the advanced Komsomol field brigade.

In one of the southern ports, state security authorities detained a spy with a plan for the object of sabotage — a floating dock, prepared for towing to a remote port. Major Lyudov, according to a number of signs, realizes that a whole group of enemies is operating in the city. With the help of Rakitina, the librarian of the floating dock, Lyudov and his assistant state security lieutenant Savelyev, they manage to unravel the tangle of espionage ties and prevent the crime.

The action takes place in 1920 during the Civil War. Crimea on the eve of complete liberation from the White Guards. Returning from patrol, the four brave “elusive” knocked down an airplane. In the field bag of the captured pilot, they find a secret report, which speaks of the existence of defensive fortifications around the coastal city, which the Reds have yet to take. Young heroes get the task to get a map of fortifications and go to the city...

The manager of the Belarusian collective farm Naideika Krasovich, inspired by the award at the All-Union Agricultural Exhibition for the high flax harvest, gives her word to double the harvest. Many fellow villagers doubt her success, and only Grigory Pavlovich, the new director of MTS, who left his family in the city and came to the village at the call of the party, provides Nadeika with all kinds of support and excessive attention, because he loves and, it seems, is loved. In parallel to this story, a plot develops about the love of the tractor driver Zosya for the forester Yanka, who unrequitedly suffers for Nadeyka.