After an injury, Lieutenant Ivan Groznykh (Vitaly Solomin) is appointed commander of the women's air defense unit.

Among his subordinates is a brisk and sharp-tongued sergeant Oreshkina (Nadezhda Rumyantseva), who causes a lot of trouble to her commander.

As result of an incident, they fall deep into the territory occupied by the Germans, flying above the front line on a barrage balloon.

Knowing that Germans will sweep the area for possible saboteurs Groznykh and Oreshkina disguise themselves as local residents - grandmother and grandson - who agreed to give their clothes.

They manage to escape on the stolen German car by crossing a river, wondering, what other adventures await them behind enemy lines...