A policeman gets killed and the short-staffed police chief sends for a few experienced officers to support him in his fight with organized crime. Meanwhile, a conflict between local gangster groups escalates.

Karol, an ordinary young man, runs into a much older man, whom he believes to be the so-called Red Spider, the terrifying serial killer prowling the streets of Kraków in the 1960s. Karol becomes obsessed with the man and spies...