Director
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.
Director
The foreign spy Thomas arrives in Sofia. In order to get his hands on some documents, he decides to use the young man Boyan as his cover. The action takes place at the "Orient Express". A young foreigner-drug addict, the train attendant and the secretary conduct the mission. The train attendant and the drug addict are killed. Boyan is a major suspect. However, Thomas is a very naive man. The Bulgarian counterintelligence discovers the plot.
Director
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.
