A war drama set during the Nazi invasion of the Soviet Union in June 1941, in which Russian troops held on to a border stronghold for nine days.

The film shows the heroic defense of Brest Fortress, which has taken upon the first stroke of German fascist invaders on June 22 1941. Story describes the events of the first days of defense.

The film tells about three main resistance zones, headed by the regiment commander, Pyotr Mikhailovich Gavrilov, the commissar Efim Moiseevich Fomin and the head of the 9th frontier outpost, Andrey Mitrofanovich Kizhevatov. Many years later the veteran Alexander Akimov again and again recalls the memories of the time, when he, then a 15 years old Sasha Akimov was deeply in love with beautiful Anya and suddenly found himself in the middle of the bloody events of war.