The Prague Research Institute of Air Engineering is to prepare a proposal to reduce dust in Ostrava, especially in the area where the new power plant is to be built. That is why engineers Vojtěch Spára and Jiří Zástěra will travel to Ostrava. Eva Frágnerová, a hygienist, will strongly oppose the power plant project near the housing estate.

Spring 1943: A three-member group of resistance fighters flies from a Soviet military airport into the Protectorate of Bohemia and Moravia to establish contacts with an illegal communist center in the occupied territory.

Now we see a naive reminder that television used to broadcast live productions, but in this case the live broadcast has taken on a surprisingly criminal dimension. One of the actors was killed during the broadcast - and it was seen by all the five million people who watched. Investigators are then reconstructing the suspicious event to find out whether it was an accident or a premeditated crime...