A terrorist act is being prepared against the state of Azerbaijan and its head by the hands of Armenian special bodies. International terrorist Zorik Babayan, who leads the ethnic cleansing operations against Azerbaijanis in Karabakh, receives an assignment from the Armenian state to kill the head of state of Azerbaijan. Despite the operative operations, Zorik Babayan manages to come to Baku. In addition, a group of traitors is trying to prevent the neutralization of the terrorist. General Ali Talibov is assigned to prevent a terrorist attack.

The film is about a day of the 19th-20th century famous tycoons from Baku Agha Musa Naghiyev and Hadji Zeynalabdin Taghiyev.

Before his death, the jeweler wrote a will in which he mentioned the famous diamond "Abbas Shah." But when the heirs discovered his personal safe, the diamond was not there. Without hesitation, they turned for help to the detective Drongo, who, as everyone knows, is able to unravel the most mysterious thing. The detective immediately established a circle of suspects and began to screen out those who had an iron alibi. But suddenly his list began to decline for a completely different reason - someone began to kill the suspects one by one...