The sophisticated thief of art Robert "Cuma" Cuminski is released on probation from the local prison by the corrupt Doctor Wiaderny to organize the theft of the famous Leonardo Da Vinci painting "Lady with Ermine" for the dealer Gruby. Three years ago, Cuma was accidentally arrested by the snoopy detective Wilk after a successful heist in the house of the collector Lehman, but he has not ratted his comrade Julian.

Robert Więckiewicz
as Robert 'Cuma' Cumiński

Borys Szyc
as Julian 'Szerszeń' Paulewicz

Marcin Dorociński
as Łukasz Wilk

Kamilla Baar
as Magda

Jan Machulski
as Tadeusz Hagen

Jacek Król
as Jan 'Werbus' Bednarek

Mieczysław Grąbka
as Mieczysław 'Gruby'

Łukasz Simlat
as Marcin Kudra

Halina Łabonarska
as dyrektor muzeum

Jerzy Grałek
as Dr. Zenon W. Wiaderny