This light-hearted comedy operetta tells the story of a newly appointed high school professor who becomes an ideal target for pranks and jokes.
The Portorican prime minister asks British detective Sherlock Holmes to find a twin for King Fernando XXIII, a weak and frightened man who fears anarchists and does not want to show himself in public. Holmes finds in the Czech newspapers a photo of the perfect double, František Lelíček, a daring bon vivant drowned in debt, so when Holmes offers him money, Lelíček decides to travel to Portorico and play the role.
A lyrical tale of the pure, vernal romance between a diffident, somewhat naive girl from a rural backwater and a fairly dissolute, but kind-hearted law student from Prague.
The film depicts the adventures of Kacenka (Zdena Kavková) and Vincek (Vlasta Burian), two innocent country bumpkins who live in a Czech small town, and the various jobs that Kacenka has once she moves to Prague, that beautiful capital city. Our heroine will have to bear difficult working conditions and to make things worse, she falls in love with a fake aristocrat. Fortunately her companion, Vincek who is also in Prague, has an unrequited love for her. Though he is the cause of many Kacenka's problems, Vincek finally will help and resolve her loves troubles. And of course there is a happy ending that brings the Czech couple together.