An industrialist's wife announces that she is leaving him, but returns shortly after and tells him that she will only stay with him for appearances. This causes the industrialist to rethink his life choices.
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.
A simple governess and a wealthy aristocrat fall madly in love with each other. However, his family are prejudiced towards her and have other plans for him.
