Prague in the 1930s. A young, pretty girl gets on a crowded tram. She immediately catches the attention of a young man who not only appreciates the girl's charm, but also tries to steal her handbag discreetly. And so we meet one of the main characters of the film, a swindler, pickpocket and generally strange being Josef Kořínek alias Pépi. In addition to him, the story is populated by other characters from the Prague outskirts. Of course, the film also features the shrewd councilman Vacátko and his inseparable investigators Brůžek and Bouše. They have a sad duty - to track down the murderer of the collector Krále, who was found dead and who lost a sum of money on the way from the bank that could interest many people from his surroundings...

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A boy kidnapped by two mismatched hitmen puts them at each other's throats while being driven to their employers, possibly to be killed. Cohen, an older professional becomes increasingly irritated with his partner Tate, a brutish killer, when their prisoner uses unnatural guile and resourcefulness to play them off against each other.

An attack is carried out on the accountant of a research institute, and a large sum of money is stolen. The criminal investigation colonel not only solves the crime but also investigates its motives.

One-armed war veteran John J. Macreedy steps off a train at the sleepy little town of Black Rock. Once there, he begins to unravel a web of lies, secrecy, and murder.

Lieutenant Vasátko is spending Christmas vacation in a mountain cabin where a diverse group of people have gathered. The painter Horác and two married couples, the director Skorkovský and his wife and his new discovery, the not very clever Jájinka and her husband. There is a murder and an unusual denouement.

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Joseph Sheridan le Fanu's tale, "Inn at the Flying Dragon," brings dark fantasy, ghostly apparitions, and mysteries to the TV screen. It's part of his well-known collection, "The Dark Mirror," published a century ago, yet still captivating readers today. Bohumila Zelenková drew inspiration from this novella, not just for its mysterious and romantic elements but also for the characters' intriguing portrayal of the post-Napoleon era—a time when many sought greatness, even if it meant embracing deception.

In a suburban villa, a woman of means is murdered. Police Superintendent Zdychynec from the Prague Liben neighborhood reports the case to Police Councilman Vacátko, upon whose order an investigation is launched immediately. Zdychynec begins to suspect the wooer of his own daughter, a handsome dragoon named Rudi, of the crime. In Rudi's absence, Zdychynec searches his rented room in the apartment of the elegant Mrs Dragicová. All his findings - among others, sand left on Rudi's jackboots and a decent amount of money in his bedside table - convince the superintendent that he is following the right lead, especially when Rudi refuses to say where he was at the time of the murder.

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…

In the morning twilight of Prague, the dead body of the safe-breaker Toufar is found floating on the river Vltava with a knife in his back. Police inspectors visit Toufar's lover, the prostitute Anna Kulatá (Jirina Bohdalová), nicknamed Umbrella, and it is apparent that the moment before she opened the door of her flat, someone fled through the window. Umbrella is summoned for examination to the head of the criminal police - Police Councilman Vacátko Jaroslav Marvan, but although shocked by the photograph of the dead man, she does not confess to anything. Before Toufar, Umbrella lived with the safe-breaker Penicka (Radoslav Brzobohatý), who loved her very much and made her quit her street trade. But when he was sentenced to three years' imprisonment, Umbrella began to live with the brute Toufar, who chased her to street again. In the case of the murder, Penicka is therefore the prime suspect.

Commissioner Bartošek is visited by Dr. Goldberg, who reports the disappearance of his friend, the famous actor Benda. From the flimsy evidence, it appears that Benda left his apartment one night without taking anything with him and was taken away by car. He had not gone out for the entire week before, had not washed, had not shaved, and had drunk until he was debauched. The police search has reached a dead end. The actor Lebduška reveals to Goldberg that Benda had an affair with the actress Gréta, the wife of a prominent businessman, Bartošek's classmate Korbel. Goldberg eventually manages to exhume an unknown vagrant, whose body was found shortly after Benda's disappearance...