A spring is hidden in the Iron Mountain but the people of Arzen cannot get to it and they are suffering from thirst.

The students Yoshkata and Petar share rooms and wartime privations in a poor man's street. Over a glass of vine, Yoshkata often talks about the stage life of genuine beauty. The student is unaware of the passion with which Vaska, the barmaid at the local pub, burns for him. Petar is a member of an antifascist combat unit. The pupil Katya loves him. Petar carries out a sabotage action and comes home wounded. Yoshkata manages to deceive the Germans who rush into their flat that they have been drinking and playing cards throughout the evening. He saves his friend. However, the secret agent notices the doctor's visits. When the police arrive to arrest Petar, Yoshkata tries to resist them and the agent shoots him dead. Petar goes underground. On the day of the liberation, all the residents of the poor man's street celebrate, and Katya and Petar happily reunited. Vaska is there, too, a baby in her arms, the fruit of her love with Yoshkata...

Constantinople, 1883. During an outing to the Black Island Edith, the adopted daughter of the French ambassador, is saved by Kalin the Eagle. She learns that he is a Bulgarian revolutionary from the April Uprising of 1876. With her help Kalin the Eagle escapes and returns to the liberated Bulgaria, where he is drawn to the socialist movement. Edith finds out that Kalin is in fact her father, and sets out in search of him. Kalin the Eagle is notable as the first movie made by the nationalized film industry after World War II in the newly formed People's Republic of Bulgaria.

A Bulgarian village before the First World War. The young and ambitious farmer Enyo loves the beautiful but poor Tsveta. His brother and his wife arrange their engagement. The hunchback girl Stanka, daughter of the richest man in the village, is in love with Enyo. Because of her father's lands Enyo decides to end his engagement with Tsveta and starts building up his farm.