An escaped inmate of a mental home, Franz Moose, has been found shot dead in the forest. In the course of their investigation, District Commander Havel (Jirí Adamíra) and Lieutenant Mares (Miroslav Zounar) slowly work their way through the complicated case. Havel learns from the employees' testimonies that Moose was facing trial for war crimes before he was finally sent to the hospital. There he shared his room with Kozdera, spent his time painting, and made several attempts to escape. Havel wants to interrogate Kozdera but the unfortunate patient gets killed before he can do so.

The year is 1943. The war is raging between the Germans and the Allies in North Africa. A truck with a Czech crew, Lieutenant Navara and six soldiers, escapes from the Foreign Legion fortress. Their aim is to reach the Allies and fight against Nazism. The truck is destroyed by a German army plane, which is hit by enemy fire in its turn. One Czech soldier dies in the attack, the driver is badly wounded, and Navara has serious burns on his face. The group has very little water and must reach an oasis that is 60 km away.

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 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.