This modestly budgeted, made-for-TV romantic comedy became one of the most popular films in the former Soviet Union and a staple of TV broadcasts on New Year's Eve. It's based on the premise that modern apartment complexes look so much alike that one cannot distinguish one city from another. On New Year's Eve, Muscovite Yevgeny Lukashin (Andrei Myagkov) finally dares to make a marriage proposal to Galya (Olga Naumenko). They plan to celebrate the New Year together quietly, but Lukashin's friends convince him that first he should attend their annual meeting at a bathhouse. The meeting quickly turns into an improvisational bachelor party for Yevgeny. Having consumed large amounts of alcohol, they cannot remember which one of them was supposed to fly to Leningrad to meet his wife. So they put the sleepy Lukashin on a plane. Upon his arrival in the Leningrad airport, Yevgeny gives the taxi driver his Moscow street address and the cab takes him to an apartment complex located on a street with the same name. The building looks very much like his own, so Lukashin, still not quite sober, does not realize that he is in another city. He enters someone else's apartment because his key fits the door lock and he quickly falls asleep on a couch. When the apartment's rightful resident, Nadya (Polish actress Barbara Brylska), comes home, she wakes up the intruder and tells him to get out. The bewildered Yevgeny insists that he is at home and she is the one who should get out. Eventually he sobers and finds out about his predicament. He is about to leave when the situation is further complicated by the arrival of Nadya's straight-laced fiancé Ippolit (Yuri Yakovlev) who does not believe in Lukashin's story and accuses Nadya of being unfaithful. The interaction between the three characters results in Nadya and Yevgeny's gradual falling in love with each other.