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.

Postman Brabec is a welcome guest of the revue theatre for his sense of humor, and he brings his director Holt letters from female admirers every day. Holt's fans include Brabec's sister Anny. The girl would like to join the theatre, but for the time being works as a maid for the actress Velden. A new revue is being rehearsed, the name of the author is secret. Veldenová will return the role just before the premiere because she doesn't like it. The quick-witted Brabec introduces the director to his sister, who knows all the parts by heart.

Woman concert star seeks to connect with her adult daughter, by her former marriage to a staid industrialist who has kept the two apart since the girl was very small, and receives inadvertent help from the industrialist's just-fired employee who has fallen in love with the girl.

The owner of a clothing store, Mr. Načeradec, spends most of his free time in a café, where he plays chess with the owner of a rival store, Mr. Dundr, over mineral water. Načeradec's daughter Edith, coincidentally, starts practicing law at the same time as her boyfriend, Dundr's son. Mr. Načeradec often fills in for Mr. Findajs at the card company, who is currently dedicating himself to the wife of another player, Mr. Tachecí, the owner of a detective agency. Načeradec keeps his winnings, Findajs has to pay for the money he loses. One day, Mr. Načeradec is so unlucky in the game that he and Mr. Dundr get into a heated argument that ends up in court. Both men are represented by their children, who are rather amused by the situation.

Young music composer Viktor Honzl in vain looks for work. He is prevented from committing suicide by a technician of the gasworks who shortly beforehand has disconnected his gas due to past due bills. In the disguise of an older, serious, musical scholar Viktor obtains work in a music publishing house.

Silvestr Blažek loses his job, but he doesn't lose heart. He also courts the saleswoman Boženka Straková. The driver of the builder Herold, Karel Verner, is also interested in the girl. Boženka is the daughter of Narcis Straka, a man with a mysterious past. However, Herold's father-in-law Jakub Suldovský recognizes him as an old friend from Vienna, where they both loved the same woman....

Based on an anonymous letter about Margot's fiancée's infidelity, the factory owner Hora hires detective Pejsek. His investigation then reveals Margot's efforts to obtain money from the factory owner for her lover Pepito, a fake gambler and swindler. Pepito has lost twenty thousand and must pay the money by midnight. At a fashion show, Margot receives a check from the factory owner for the purchase of a fur coat, but accidentally puts it in the pocket of a fur coat that the saleswoman and model Eva secretly borrows after the show...

Mimi lives with her parents and the maid Fanka in a villa near the forest. One day, a gamekeeper comes to court Mimi when her parents are away.