There are two competing sports equipment companies whose primary product is tennis rackets. The biggest star, and thus the advertiser, is Jadzia Jędruszewska, who plays with a Malicz racket. A competing company - Oksza - decides to take over the competitor. To this end, a sportswoman's heir, young Jan Oksza, goes to the hotel. He meets a girl leaving the room and immediately proceeds to the implementation of the plan. The problem is that Jadzia, whom he began to adore, is not the famous tennis player but Miss Maliczówna, who handed over a new racket at the hotel. This is just the beginning of a series of misunderstandings.