Tomek (Olaf Lubaszenko) is a nineteen-year-old orphan, living with the mother of a friend and working at the local post office. He has been observing an attractive woman in her thirties, Magda (Grazyna Szapolowska), and fallen in love with her. He sends false notices from the post office to her, calling her to pick-up money, which does not exist, just to see her. In the evenings, he spies on Magda, who lives on the other side of the street, using a telescope that he stole and also calls her frequently. Magda changes boyfriends quite often and Tomek manages to ruin her dates by calling the gas service to check a leak.
Tomek wants to see Magda anyway so he takes an extra job delivering milk in the mornings, so that he can see her more often. Magda goes to the post office to collect a new note that Tomek sent her but is accused by the Office Manager of trying to rob the office by presenting false notes, Magda storms out of the post office and Tomek follows her and confeses to his peeping, she initially does not believe him but when he says that she was weeping last night she becomes angry, because it was true.
That night Magda spots Tomek peeping again as makes signs that he should call her, he does so and she tells him to watch closely, she receives her current lover and just as they are about to begin having sex she stops and tells him of the peeping going on, he becomes angry and goes to Tomek's building and demands to speak with him, he comes out and there is a fight which is naturally lost by Tomek.
The next day Magda opens the door as Tomek is delivering milk to her, he declares his love to her. After inquiring as to what he wants with her, which he cannot answer, she accepts going out with him on a date to have ice cream. After the ice cream she engages in a little game, if they reach the bus home he shall go to her apartment, if not, he shall go home. Back at her apartment, she takes his hands and places them on her barely naked body, he is very exited and finishes even before he can actually touch anything else than her thighs, after this she says that that is love and nothing more, if he wants to clean up there are towels in the bathroom. Tomek is shattered and storms out of her place; he tries to commit suicide. He is taken to the hospital and Magda does not see him for a long time and becomes worried.
She recognizes that now she is obsessed with him and tries to do everything to see him again, talk to him and explain everything. Later on, Tomek is back from the hospital, working again at the post office. Magda comes to see him, Tomek says "I am no longer spying on you, madam."
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