Imperialist spies try to disrupt and stop production in a large steelworks.
Urszula Modrzyńska , Feliks Żukowski , Zdzisław Mrożewski , Jan Żardecki , Stanisława Perzanowska , Wiktor Grotowicz , Ludwik Benoit , Halina Billing-Wohl , Zygmunt Chmielewski , Adolf Chronicki
WFF Lodz