before his death, Tadeusz deposited all his savings, 19,000 złoty, in the bank of Kramer, but on the way home he was robbed, the raiders took away the receipt and the bank deposit became unavailable. The next day Tadeusz allegedly threw himself out of the window. According to the widow, the police arrived to conclusion that there was a suicide. In the memory of a perished friend, Marta gives Kwinto the Tadeusz's trumpet. In its mouthpiece Kwinto discovers a note of Rychliński where it says "I know how Kramer became an owner of the bank". Kwinto arrives to conclusion that robbery and staging of the suicide were committed at the Kramer's request. In the light of the discovered circumstances Kwinto starts to act. He finds Moks and Nuta in their automobile shop and instructs them to find the last address of his old friend Duńczyk. 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. He sends to Kwinto Krempitsch, a hired killer, who sometime ago killed Tadeusz by pushing him out of a window. But Kwinto, who foresaw the action of the banker, takes care of Krempitsch by himself. The brothers have not found Duńczyk. The search has been taken over by Kwinto himself and, remembering his old habits, finds his pal at a football game. However, Duńczyk has finished with his criminal past and more than anything he values a peace. At first he refuses, but Henryk convinces Duńczyk that for him taking vengeance on Kramer is a matter of principle. They witnessed that Krempitsch, trying to kill Kwinto, accidentally kills a complete stranger. Taking the advantage of a muss, heroes leave the stadium. After all Duńczyk agrees to participate in his friend's daring plan. Kwinto presents his plan to rob the Kramer's bank and that under suspicion turned to be the banker himself. Duńczyk heads on reconnaissance to the bank and opens to be obvious an account there. With experience eye, he assesses all alarm features of the bank's building and in his home workshop by method of trial and error selects the shape of the plate capable of blocking the alarm. The companions begin to implement the plan. Kramer on accident as he thinks meets with a charming Natalia whom he helps to start the stalled car. A