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
Miloš Willig
as poručík VB Skála
Ladislav Potměšil
as učeň zvaný Domovníček
