In September 1923, during the so-called 'anti-fascist' uprising, police chief's daughter Kita falls for a student with communist beliefs. Although loyal to the monarch, her father's paternal instinct force him to compromise but his retaliation against the rebels takes a devastating turn.

In the trial against Boris, Lazar is the main witness for the prosecution. The two are the comrades-in-arms. Now they are opponents, because of a conflict concerning a coal conveyor where they work. Lazar is afraid of taking risks. Boris, however, is not afraid of taking responsibility where innovation is at stake. The conflict ceases to be confined to production problems and grows into dispute over commitment to principle and ethics. After harrowing hesitations the main witness Lazar gives evidence in Boris's defense.

The intelligence officer Emil Boev is tracking a group of drug addicts, who were recruited by a foreign intelligence office. Among them is Boyan, the son of Emil's dead comrade. He should help the boy. He includes Boyan in the counterintelligence action plan. The faith of the young people is sealed - they should be eliminated as unwanted witnesses. They are given hot doses. Boev and Boyan discover the plot, but it is too late for some of the people. The deadly needle gets in the hand of the girl that Boyan loves. The foreign resident is captured. There is hardly anyone at the grave of the girl. Only Boev and Boyan come and listen the requiem.

World War II. Vasil is in serious conflict with the police officer Simeonov and at the same time with his childhood friend and brother by faith - the partisan Kalin. Yana comes between Vasil and Kalin. She has grown up with them and they are both in love with her. She loves Vasil more but she cannot accept his individualism. The tragic struggle in Vasil determines his doom. After the coup on September 9, 1944, he arrests Simeonov, but when he takes him to the military tribune, he dies unexpectedly.

The Bulgarian intelligence officer Emil Boev is residing in Bern, close to Bulgarian political emigrant Goranov. The Swiss and German women Rosemary and Flora are interested in him. Goranov is killed. Boev searches his apartment and finds few fake diamonds and the list of the spies in Bulgaria. Boev and the boss of a foreign intelligence service Benton are stuck in a bunker together. At the decisive moment, Flora appears and Boev manages to get away with the list of the spies. Boev is on the way to Bulgaria.