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.

The gullible buyer Žemla Martin (Francis Smolik) finally opened his dream shop. After a while, you get a lot of friends. Especially the former captain Kyllijána (Vlasta Burian), who come to him to drink brandy debt and sit on a bag of peas, where he talks nonsense. Its debt is starting to grow nicely. Later dupe marry an evil Pavlina Šustrová (Ela Poznerová). It can also bring their calculating mother, widow Catherine Šustrová (Antonie Nedošínská). These two together with a bun Kyllijánem use, but outside him are friendly. Later, when Žemla catches his wife cheating when he has become the father of a foreign child, and when he discovers that the shop is broke and completely vyjedený, poisoning. A best friend Žemlův captain Kylliján happily drunk debt for plum deleted.