One night, the kozjak Aljoša kills a priest of the Russian church who found him in the robbery of treasures hidden in the church walls. Young Inspector Stanko Pletikosic gets his first task - to solve this murder together with the inspector-inspector and veteran veteran Andrej Tanasijevic Tane. Stanko seizes Tane in the bar, and the beginning of their cooperation does not seem to be promising. People of Vrangel who are stationed in Belgrade, Colonel Sorokin and Captain Fjodor Fjodorovic, realize that Vrangel's relics have been stolen from the church, but they do not confess it to the police. At the insights of the church, Tane and Stanko seize the bloody message "greeting from Tatk". This message seduces Tanet and Stanko, as well as Vrangel's people, on a false track - Macedonian opium smugglers ...

In the late evening hours, Tane and Stanko meet again at the inspectorate - at the masquerade at the House of Commons. Wife of public prosecutor Vojin Djukic, Violeta, someone cut off his head. Tane notes that the victim and Maja Davidovic have identical costumes. He examines Maya and Vojina and quickly concludes that Maya is Vojin's mistress. But, Chief Dimitrijevic appears on the inspectorate and forbids Tane to further question Vojina and Maja.

Tane and Stanko found out in a photographic shop only that the heada killed Neven in order to take away photographs of the masquerade. Tane still worries more that Maya was on the spot again. She was suspicious, so she took her to the Hampshire where she examined her, and then shook her purse. Maja is scared that Tane found the negatives in his bag, but he cures when he is released and when he sees that the negatives are still there. However, Tane replaced the negative .....

After Aljosha is abducted and killed, Tane is furious with Dimitrijević and suspects that the prison doctor was paid to get him out of prison.

Tane, barely alive, finds Niški with her people and leads him to Prša. Tane learns from Niski that Krojač is a war veteran and that in the past he has been in contact with the famous Tankosić and his "black arm boys".

Maya was initially shocked that Avram was a butcher, but when he recalls some details, everything begins to get a new meaning.

Tane and Stanko examine the evidence against Živojin, who could have been involved in Avram's death.

A raid in Macedonia comes as retribution for Damjan's abduction. Stanko admits to Tane that he killed Stavre.

Tane finds Stanko in a bar. Tane tells him to go to Toponica and talk to Prince Djordje , the author of the painting "The Black Sun", which hangs on a wall in Avakumović's house.

The final clash is close. Tane and Stanko ask Dimitrijević to guarantee that Kaluđer will be brought to court if they arrest him.