The workers at the ironworks are working to fulfill a two-year plan. The spy group takes advantage of the bitterness of a disrespected innovator and tries to extract information from him about a new technology for pressing metal powder. However, their plans are thwarted by the vigilance and vigilance of the research staff from Department Z-8.
Josef Bek
Milica Kolofíková
Jiřina Petrovická
Karel Pavlík
Ladislav Boháč
Bohumil Machník
Jiřina Šejbalová
Jiří Dohnal
Miroslav Homola
Vojta Plachý-Tůma
Miloš Hájek
Emil Bolek
Josef Chvalina
Vítězslav Vejražka
František Kovářík
Viktor Očásek
J. O. Martin
Bolek Prchal
Zvonimir Rogoz
František Holar
Antonín Šůra
Jaroslav Zrotal
Libuše Bokrová
Jiří Smutný
Vladimír Krška
Vítězslav Boček
Jindřich Fiala
Vlasta Vlasáková
Anna Kadeřábková