Herod is not idle, he kidnaps Popielski's son. The situation is getting out of control. You failed, Lodzia did not take care of Jerzyk, Popielski swears revenge on Herod and the whole world. Herod meets Popielski at a closed swimming pool, in his mouth he hid an ampoule with the address of Jerzyk's detention. Popielski kills Herod, but the ampoule is empty. Someone taunted him.

Wrocław in 1946 is the world after the apocalypse. Everyone seems to be tainted by evil. And yet, in Popielski's poor apartment, someone special appears. Professor Stefanus, a man who absolutely believes in human evolution towards good. He comes to Popielski with a job offer. The detective is to discover who, among the students of Stefanus's secret philosophy course, is the informer. Circumstantial evidence indicates that one of the three girls is a spy.