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.

The last days of 1933. After the failed attempt to assassinate King Alexander in Zagreb, it is clear that Yugoslavia is in a serious political crisis. Great political and strategic games are entangled both domestically and abroad, the very survival of Yugoslavia is called into question. However, Belgrade is shaken by something completely different; a gruesome murder on Avala, in the medieval fortress of Žrnov at the place where a monument to the unknown hero Ivan Meštrović will soon be built. Inspector Pletikosić, the current head of the Belgrade Department for Blood and Sexual Crimes, takes over the investigation, with the help of his young assistant Zečević.

After the arrest of the insane Rajko, an order comes from the highest institutions to stop the investigation of the murder in Žrnovo. Inspector Pletikosić, doubting this theory, asks for help from his friend and former boss, Inspector Tanasijević, who, having left the police, now leads a completely different life. As the disappearance of Novicki represents a serious problem for the state, Prince Pavle orders General Živković to find out as soon as possible what happened to the count. That disappearance also seriously disturbs Maja Davidović, who did not fulfill the task entrusted to her. Mustafa Golubić, protected in his shelter, slowly weaves a web in order to find out what kind of conspiracy is brewing. Everyone sticks to their own interests, alliances are established, but nothing is as it seems at first glance.

The killer's trail leads to the grave of the unknown hero and the secret of who is really buried there. But while investigating that clue, Stanko and Zečević, with the help of Tane, come across clues that spread the mystery even more. Meanwhile, in Italy, right on the border with Yugoslavia, a new "strong" man of the underworld is preparing to enter the scene. Tomasović rescues the Macedonian terrorist Damjan from his Ustasha friends yesterday, and through him he wants to establish the Yugoslav production and distribution of a new drug - heroin. Fortunately, Maja Davidović and Mustafa Golubić, although ideological enemies, decide to cooperate in discovering who is behind the plot to kill the king.

A huge scandal erupts with the discovery of Count Novicki's corpse. Maja asks Tane for help in the investigation that she is conducting herself. The plan to demolish Jatagan Mala and build a new settlement in its place is starting to be realized. Mirić receives instructions to cooperate with Godina, a mole in the Ustasha ranks, in the opium trade. Obrad Savković, the owner of the magazine "Novog doba", implements his agenda step by step using intrigues and blackmail. Maja gets more and more entangled in a story she doesn't fully understand. Tomasović approaches Mirić in order to agree on cooperation. Sonja, Tane's ex-wife, leaves her husband. And while it seems that new alliances have been made, in a moment everything changes, and the killer continues his bloody feast.

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