The discovery of an unexploded aerial bomb on a construction site brings a shock to the peaceful existence of a small town: the sudden threat makes at least some people rethink their previous attitudes.

Zdeněk Štěpánekas master mason Frantisek Vokác
Gustav Heverleas driver Zach
Vladimír Hrubýas hauler
Otto Lackovičas bulldozerist Jarda Sejk
Marie Kyselkováas Lida, Sejk's wife
Rudolf Deylas mason Toník Prokop
Vlasta Chramostováas Helena, Prokop's wife