A car deliberately runs down a young man on a road by a small border town. The locals recognize the dead man as one of the students who were there on volunteer work some time before. The police detectives, Major Kalas (Rudolf Hrusínský) and Lieutenant Varga (Radoslav Brzobohatý) can then get on the trail of the people with whom the victim was involved, especially at the photographic studio headed by Bohuslav Pacer (Bohus Záhorský).

Rudolf Hrušínský
as major SNB Kalaš

Radoslav Brzobohatý
as nadporučík SNB Varga

Bohuš Záhorský
as vedoucí Fotografie Bohumil Pacer

Helga Čočková
as Věra Klímová

Soběslav Sejk
as příslušník VB Suchánek

Zdeněk Hodr
as profesor Hechtl alias Horyna

Bohuš Hradil
as MUDr. Hanzl

Pavel Spálený
as Ondráš

Vlastimil Fišar
as předseda senátu

Jan Pohan
as