Young men Štěpán, Ludvík and Karel became friends abroad, where they fought during World War II. Now they have returned home and are thinking about their future. Štěpán is a designer, so he starts a car repair shop. There is also work for Ludvík, while Karel gets a job at the Omega car factory. However, the young entrepreneurs are all in debt and their business is not prospering. Štěpán invents a car carburetor, but he has no way to test it. In his greatest need, he receives news that Štěpán will inherit from his uncle from South America...