A dashing but mysterious man saves a gambler from suicide, crashes the posh party of a prominent industrialist, falls in love with his daughter, and finds himself in a web of intrigue revolving around her blackmailing fiance and a gang of counterfeiters.
Wealthy and ill Petr Kornel (Karel Hasler) is not pleased with the carousing lifestyle of his nephew. He stops supporting him financially and demands that he change his name. Out of gratitude Kornel bequeaths a substantial sum of money to his nurse Alice (Adina Mandlová) with the condition that she marries. Petr Suk (Hugo Haas), as the nephew is now named, visits the doctor. In the waiting room his X-ray is mistakenly switched with one of another patient's. On the basis of this he presently learns that he is seriously ill and has only one day of life left to him.
A Milk-Cannery baron, Jakub Simonides, is broken by the Canned Milk-Trust and, in his wanderings with a worker, Filip Kornet, he discovers he still owns a half-finished apartment-house. They rally the workers and complete the building for use as a collectivist dairy. The cooperative flourishes and after a chase/pursuit with the police, pratfalls, slapstick and various crashes, the workers buy out the Milk-Trust.
The owner of the ready-to-wear store, Mr. Richard Naceradec from Zizkov, is an enthusiastic fan of S.K. Slavia and despite his wife's opposition, he goes to football every Sunday. Tailor Emanuel Habásko lives alone with his adult son Eman. Widow Ouholicková chases Krejcí endlessly, but father Habásko bravely resists. Habásko do not recognize any other club except S.K. Viktoria. One day, Naceradec will face Eman at the match between Slavia and Viktoria.