A tabloid newspaper reporter overhears a conversation about murder between the owner of a shooting range and his niece Slávka, an avid reader of detective stories. The evidence in the case was underwear with monogram I.K. Professor Sedláček returns from Paris. His wife welcomes him fondly but when she discovers his travelling case is full of ladies' underwear, the idyll is over. But she does not want to get divorced because she loves her husband still. She just wants to punish him adequately. On the advice of a lawyer she decides to arouse his jealousy by flirting with other men.

A tabloid newspaper reporter overhears a conversation about murder between the owner of a shooting range and his niece Slávka, an avid reader of detective stories. The evidence in the case was underwear with monogram I.K. Professor Sedláček returns from Paris. His wife welcomes him fondly but when she discovers his travelling case is full of ladies' underwear, the idyll is over. But she does not want to get divorced because she loves her husband still. She just wants to punish him adequately. On the advice of a lawyer she decides to arouse his jealousy by flirting with other men.

A tabloid newspaper reporter overhears a conversation about murder between the owner of a shooting range and his niece Slávka, an avid reader of detective stories. The evidence in the case was underwear with monogram I.K. Professor Sedláček returns from Paris. His wife welcomes him fondly but when she discovers his travelling case is full of ladies' underwear, the idyll is over. But she does not want to get divorced because she loves her husband still. She just wants to punish him adequately. On the advice of a lawyer she decides to arouse his jealousy by flirting with other men.

Disillusioned with his marriage which has ended in divorce, Petr Leroy goes off to the Riviera to the place where he first met his wife and where he hopes to be spiritually revived. Here he meets his friend Jan and together they enjoy the joys the Riviera has to offer. Jan meets a charming girl at the casino and he takes her off into the mountains. On his return he speaks of the beautiful Olga with whom he has spent a wonderful three days. Olga, however, does not appear for a meeting they had arranged, so Jan goes to look for her in the mountains. Then he sees her in a village and tries to catch up with her in his car. He has an accident. Olga takes him to the nearest sanatorium where everyone behaves very strangely to the newly-arrived patient.