Impatient with the lack of police progress, her son joins Bajdykowa's case. Engineer Bajdyk is a rich and eccentric oilman. He offers Popielski a large salary for finding his murderer's mother. "Łysy" accepts the money and promises to deliver the murderer to the client. With the help of a young Jew and Leokadia, he realizes that the Hebrew code is a mathematical sequence with each letter assigned to a number. At the same time, she begins an affair with Renata.