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.
Julek doesn't want to work, he prefers to sing on the street and marry his beloved. His family doesn't want to hear about it, to which Julek sings in the voice of Eugeniusz Bodo: "That's just how cold-hearted I am..."
