On an early Sunday evening, people of the small town are reading lottery results that are hung on a board. Young man Karel Antos is annoyed that his lottery-ticket missed the main prize, a car, by only one number. Karel is going to the pub to drink away his bad luck with his friend Jirka Broz. The old accountant auditor Zelinka drops a wallet. Karel picks it up and before he gives it back he notices the winning lottery-ticket in it. Both young men accompany the old drunk man. Karel steals the ticket and exchanges it with his own. Next day, Zelinka is found dead. Investigators, Captain Tuma and the Lieutenant Líbal, soon discover that this is a murder case covered up as an accident.

Hubert Hrabe, known as Smart Boy, is a Prague dandy who is always skirting the edge of the law. Like every likable rogue, he has a worthy adversary - Police Inspector Mourek, who has long been trying in vain to put him behind bars. However, this defender of justice, who is constantly trying to outsmart his "own" criminal, ends up becoming the victim of his own zeal while hunting forgers that are as good as any in Europe, as Hubert the Smart Boy, sets a trap for Mourek

In Vražda v hotelu Excelsior, the interwar period homicide detective squad from Prague investigates the murder of a wealthy woman, Mrs Matoušová, which threatens the reputation of the eponymous luxury hotel popular with Prague’s elite. Even the retired police inspector Mrázek (František Filipovský), who works at the Excelsior as a hotel detective, is unable to help at first. Although the investigation inevitably uncovers the hotel staff’s scheming, Vacátko and his team unerringly follow the trail that leads them to the murderer…

1972 film by Václav Vorlíček