The main character is a newly appointed associate professor MUDr. Jakub Johánek, a psychiatrist and timid teetotaler, who decides to celebrate his appointment with friends in a nightclub. The celebration, which lasts until late and the amount of alcohol consumed causes the hero to temporarily lose his memory, and in the morning, the old bachelor Johánek is not surprised. He had been eyeing the charming neighbor, poor Kateřina, for a long time, but his innate shyness did not allow him to do more. And now, as soon as his brain has recovered from the attack of an unprecedented amount of alcohol, his neighbor's enterprising roommate informs him that he had disgraced Kateřina while drunk, in order to help his friend, who also loves the nice and well-off doctor, in a somewhat peculiar way.