The film tells about the fighting everyday life of the crew of self-propelled guns during the liberation of Right-Bank Ukraine. Junior Lieutenant Maleshkin, an unshooted graduate of the school, commands the crew of the self-propelled gun SU-100. All the subordinates of Maleshkin are older than him and much more experienced. The authority of the young commander is tested at every step, he quarrels, then reconciles with his crew. In addition, Maleshkin is very dissatisfied with the battery commander, he now and then threatens to remove the sluggish young officer from the command. In the crew of Maleshkin, various troubles constantly occur: either the driver will catch the commandant’s eyes in an untidy, grimy look, then a combat grenade with a dropped check will be discovered in the car, or a breakdown will occur just at the moment the regiment enters the march. Ending in a sprawling battle against German forces.

Maxim Perepelitsa is a cheerful, mischievous and resourceful young man from a Ukrainian village. He loves to make up stories and invent practical jokes. When he is drafted into the Russian Army, he doesn't stop his antics.

Based on the novel of the same name by Veniamin Kaverin. From childhood, Sanya Grigoryev was able to achieve success in any business. He grew up a courageous and brave man. The dream of finding the remnants of Captain Tatarinov’s expedition led him to the ranks of polar explorers. The life of Captain Grigoryev is full of heroic events: he flew over the Arctic, fought against the Nazis. He was in danger, had to endure temporary defeats, but the hero’s persistent and purposeful character helps him to keep his vow made to himself in childhood: “Fight and seek, find and not give up.”