Kazmierz Dziewanowicz's hobby is very strange. He collects people who were born on the 29th of February. One day he sees that in his collection there are two men with the same name, the same birth place, the same date of birth and the same parents. In the middle of the night somebody kills him. The Intelligence Agency begins investigation.

Joanna Jędryka
as Elżbieta Brylska

Janusz Bylczyński
as Engineer Henryk Nowak

Stanisław Mikulski
as Sergeant Jan Dziewanowicz

Wacław Kowalski
as Greengrocer Henryk Nowak

Bohdan Ejmont
as Major Olecki

Bolesław Płotnicki
as Kazimierz Dziewanowicz

Alina Rostkowska
as Helena Pyrzyk

Zbigniew Józefowicz
as Stefan

Kazimierz Fabisiak
as Wacław Kaczmarek

Stanisław Winczewski
as Major Bolesław Sarnicki