In this crime story, surprisingly, neither the all-powerful criminals nor the spies or saboteurs are pursued, as was once common. The plot is almost mundane: someone unwittingly siphoned off alcohol from a tanker, unaware that it was deadly methyl alcohol, intended for industrial use. Finding out where the poison has been transported and which people it endangers requires painstaking work.

Rudolf Deyl
as poručík VBŽ Václav Hájek

Zdeněk Dítě
as nadporučík VBŽ Bláha

Lubor Tokoš
as kapitán VB Antonín Drahota

Dana Medřická
as hostinská Věra Rezková

Josef Bek
as řidič Jan Valena

František Holar
as trafikant Rezek, Věřin manžel

František Filipovský
as skladník Václav Kubíček

Josef Kemr
as staršina VB Bělka

Antonín Šůra
as trumpetista

Oldřich Lukeš
as posunovač Jílek