Nine volunteers begin digging a tunnel through rugged mountain terrain. The group includes three miners. The others have come from different parts of the country for different reasons. When winter comes, a blizzard makes the road impassable and the truck with supplies cannot reach them in time. With only a hundred metres to dig, the tunnel collapsed. Everybody leaves the construction site, except the communist Damjan. In town they check in at the mine and are due to start work in two days. During these two days, one by one, they are overwhelmed with shame for leaving the tunnel, and finally return to Damjan to finish their work despite all the difficulties.

Inspector Andreev arrives in a small provincial town. He starts digging through his predecessor's unsolved case, which involves certain big shots in town.

The Soviet army is approaching the Bulgarian border. Many government ministers and army officers prepare to flee the country. The partisans take over the key administrative buildings. At the War Ministry, the commander of the armored brigade Major Essev hesitates between his sense of honor as an officer and his patriotic duty. He takes the side of the partisans.

The story is set in the 1800s.Elena and Inzarov,a revolutionary Bulgarian ,fall in love.After secretly marrying they decide to join the liberation, but on the eve of departure Dmitry dies. Elena takes Inzarov's body to the Balkans .

Captain Velkov was sent chief of a border post near the village of Novi Izvor, where he was a partisan. In Novi Izvor a celebration is being prepared to mark the switching on of the electricity. Saboteurs cut the cables, killed the watchman and set fire to the machinery on the farm.

The story of St. Cyrilus (Constantine The Philosopher) in his quest of enlightening the Slavic people.

The university student Bobchev joins a youth brigade. The commander's council entrust Bobchev with a literacy course for members of the brigade. Velizarov and Monkata arrive in the camp to carry out sabotage. They place explosives on the dam, and attempt to win Bobchev over by means of intrigue. There is a storm: the camp is put on the alert. Everyone joins the rescue work at the dam. After a long struggle with Velizarov, Bobchev cuts the burning fuse of the explosive. The dam does not yield to the pressure of the flood. Everymen sing in Jubilation.

The young Bulgarian Muslim woman Zyulker wants to study and become a teacher. Her father decides to arrange a marriage to her. After the wedding, she runs away and goes to the town. There she starts work in a hostel. Her husband takes her back. He beats and humiliates her. She gives birth to her child prematurely, takes the baby and goes to the school for Muslim in the town. She has to surmount many difficulties. The young woman meets her first teacher Stefanov. The two fall in love. With his help, Zyulker finishes her study successfully and makes up her mind to return to her native village as a teacher. Stefanov follows her and proposes to her. The two embrace.

The construction of the first socialist town in Bulgaria - Dimitrovgrad.