Gabriela Vránová plays a perky student Kamila who meddles with police investigation. That's why the police captain Exner leaves her guarded by his colleague in his apartment. As a revenge she pretends that she was kidnapped (the kidnapper turns out to be her father). When the policemen beat the kidnapper up Exner hurries upstairs (and we can hear some muffled noises). He enters the attic and sees Kamila tied to a chair with her hands behind her back and gagged with her scarf.
Unfortunately after that we find out that she isn't tied at all and Exner comments the situation: "Well, it's quite a stupid joke."