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... see more