One of the characters, Milan Klein, is a corrupt politician who becomes Prime Minister, and is inspired by Stanislav Gross.

The Prague criminal world is dominated by Milota and Sivák, and Káčko starts a business with them, stealing 260 million crowns from them in the process.

Káčko gains more influence and earns millions of crowns through various frauds and plans to overtake the Čepro company, which owns all fuel resources in the country.

Káčko decides to spare Sivák because he was only obeying Milota's orders, and gives him a list of people he is supposed to murder.

The police raid Káčko's mansion and arrest him, but he escapes when he asks to use the toilet and flees from the Czech Republic.

Lánský reopens his investigation of Káčko, who had "sobered up" and made money selling imported toilet paper in Seychelles.

Lánský sends agents after him, and Káčko angrily reveals his association with Klein to the media which leads to the fall of the government.

Káčko becomes the most powerful mobster in South Africa but starts to have problems with the public and is threatened by possible loss of his fugitive status which would lead to his extradition to the Czech Republic.

Lánský tells him during the investigation that Káčko's family returned to the Czech Republic, but he cannot assure their safety against Sivák.

Káčko has Sivák killed to protect his son and wife, and the film ends with him facing trial for his crimes.

[10] Věra Míšková called Gangster Ka an average film but praised the performances of Čermák and Bjelac.