December 1956. The region by the Tisza is evacuated because of a threatening flooding. Laci, Karcsi and Péter leave their home on the lorry

Mihai Toth worked for forty years as a watchman in a timber warehouse. On his last watch, there was a fire: the warehouse burned to the ground. The damage amounted to one and a half million forints. It was a terrible blow to Mihai, who had worked honestly all his life. Suddenly it turns out that Mihai has won one and a half million forints in a lottery. Wanting to save his good name, he wants to deposit this sum in the state treasury. But it turned out to be not so easy: the cause of the fire has not been established and Mihai's guilt has not been proved. That's why nobody had the right to take money from him. For a long time Mihai wandered from one institution to another with a request to accept money from him, but everything was in vain. Then the old man tried a trick...

In the vocational school the professionally excellent Dani János works on his own invention in his leisure time, but he does not like learning. However, even his own father learns in the evenings, he will become a teacher.

Prof. Laurent Akush from the Institute of Geophysics is working on a device that can be used to locate coal underground. For successful work he needs a tube XCX13, it is available in the West, but foreign firms sabotage the supply of the device. In his institute there is an enemy engaged in sabotage, but the professor does not believe in enemies. He believes that this is propaganda, science is above ideology, and that "scientists are made of a different dough." Laurent Akush receives an invitation to the international geological congress in Berlin, there he hopes to meet an old American friend, the scientist McLane. He takes with him his assistant Ferenc Ervish and a young Stakhanovite worker, Ishvan Kadosh. The professor does not yet know that in Berlin, Colonel Thompson of American intelligence is preparing a trap for him.

On the Spring of 1945 the Jackson circus is heading towards the border with the clown Peti and Aida, the elephant. They have to play for the Hungarian Fascists, while Peti is hiding the Jew Annuska and Sanyika.

Imre, secretary of the illegal communist party arrives in Budapest secretly in 1942, in order to start the newspaper of the party in the fight against war. Not even his own mother can see him.

The young worker Tóth Gáspár gets into hospital with stomachache. During the night his state is worsening. The doctor on duty, Málnási does not attend the patient despite the call of the nurse, for he spends the night with nurse Margó.