Drugs from West Berlin are smuggled into Karlovy Vary, through several arranged intermediaries. One of the prominent members of the criminal organization is the elegant Eva Krausová. However, even the Czech security officers have no idea that she is actually a member of Czech counter-intelligence. Thanks to her information, the criminals, led by Lieutenant Colonel Korán, can launch a massive operation against smugglers, traffickers and the drug addicts. However, the presence of undercover officers among the "ants" does not remain secret for long, and the head of the smuggling gang sends a hit man to Czechia, whose task is to disarm all those involved.—EuroFan