Taxi driver Koukal (
Miroslav Machácek) is stopped by the police for a routine traffic check. In the boot of his car the police find the body of a naked man. Koukal is arrested even though he claims he knows nothing about it. The case is assigned to Major Mlynár (
Milan Sandhaus). The police identify the corpse as that of an Austrian citizen called Mitrik. Koukal has been regularly driving people interested in gambling to a secret gaming den. The police are put onto the gambling den by another taxi driver, who admits that he drove Mitrik there. Mlynár and officer cadet Pecka (
Ivan Vyskocil) feign interest in gambling and visit the gaming den incognito.
—NFA.cz