Three provincial journeymen: a shoemaker - Szydełko, a tailor's - Igiełka, and a carpenter - Wiórek, come to Warsaw, where they end up in the "Pod Apartuszkiem" inn. Soon they unexpectedly win a million zlotys in the lottery. They divide it equally and everyone goes their own way, but they agree on "Under the Apron" next year. After a year, they all meet again. The first two lost all their money, and the third settled down and married Lucia, the daughter of a carpenter.
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.