In October 1934, a famous safe cracker in Warsaw criminal circles and also a jazz trumpeter, Henryk Kwinto, is released from a prison, where he has spent the past six years.

After arriving home, he discovers that his wife has already found a substitute for him in the face of a police commissioner named Karelicki.

Kwinto removes hidden roll of banknotes out of the chair's leg, places his key to the apartment on a table and leaves.

Near the city gates he is met by two younger petty criminals, brothers Moks and Nuta, who have successfully debuted by robbing a jewel store and now wish to have the legendary safe-cracker as an accomplice.

Soon he is visited by his former accomplice and now a successful banker, Gustaw Kramer who informs him that six years ago Kwinto was arrested not by chance.

Kramer receives back his 45,000 złoty in mail along with a newspaper cut out where placed the Tadeusz's obituary and understands that a war is declared on him.

Natalia asks Kramer to help her unfasten the necklace with the plate that is supposed to block the alarm in the bank and insensibly throws the adornment into the window where it is picked by Moks.

Downing gas masks and gloves, Kwinto and his companions infiltrate into the bank through a ventilation shaft of the restaurant located over it.

There they stun security guards, block the alarm with a plate that served as the necklace clasp, and take out of the safe all money and valued papers.

With a thermal lance Nuta cuts through a side wall of the safe an opening, and the group goes away leaving at the crime scene a plate of the necklace.

In the evening celebrating the successfully turned trick the group to which belongs Natalia as well being a fiancée of Moks divides the remaining money.

It gave the commissioner a reason to conduct the search in the Kramer's house where in basket with dirty laundry were found the stolen valuables.