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.
After becoming a licensed engineer abroad, Lucyna comes back to Poland and looks for a job. Because her wealthy father thinks it's inappropriate for a girl to work, she decides to put on men's clothes and get a job as Julian Kwiatkowski.