Slávka Budínová (Horácková)Jirí Adamíra (Horácek)Vladimír Smeral (Gaudl)Danuse Klichová (Daniela)Drahoslava Landsmanová (Berdychová)Josef Bek (Berdych)Valérie Kaplanová (Skuhrovcová)Ladislav Mrkvicka (Brezina)Karel Urbánek (npor. Sabata)Ladislav Kazda (Vysetrovatel)Oldrich Hoblík (Dr. Zámyslický)Josef Chvalina (Frantisek)Lubor Tokos (podplukovník Máca)Jana Andresíková (Eva)Karel Belohradský (ridic VB)Vlastimil Canek (Dr. Drevíkovský)Valerie Chmelová (Stloukalová)Jirí Cimický (Hejlík)
A retired detective Václav Gaudl begins to notice some suspicious behavior of the elegant husband of his niece Hedvika. He asks his friend, Lieutenant Colonel Maca, to find out where Professor Horacek is going in his borrowed taxi car. Horacek is a financial expert of foreign trade companies and lectures at the university, Hedvika works as an editor in a publishing house. They live in a large villa, have two cars, a cottage. The wife, who is trying to keep her husband, does not know that he has a young mistress, their lodger Daniela, with whom he goes to the cottage after lectures. When Horácek decides to divorce her, Hedvika creates a hysterical scene in which she first declares that she will never divorce and finally causes an accident in which the young hitchhiker dies. Hedvika persuades her husband to leave the scene of the accident. The man does so because he has no idea that his wife took a picture of him dragging the corpse into the bushes. Professor Horacek decides on a radical solution. He prepares and executes the murder in cold blood.