Two apartment house dwellers, although unrelated, share the same name. One is an older man with an appreciation for and love of classical music, while the other is a younger man addicted to swing music. The niece of the older man arrives for a visit and gets into the wrong apartment. Complications arise.

Eugeniusz Bodoas Henryk Pączek
Helena Grossównaas Lodzia Pączkówna
Józef Orwidas Hipolit Pączek
Ludwik Sempolińskias Kulka Kulkiewicz
Stanisław Wolińskias Protazy
Feliks Chmurkowskias Stefan Bonecki