An unconscious woman, a victim of an assault, is located in Munkkiniemi. Harjunpää is assigned to the case, which seems to be linked to other attempted assaults that have been reported in the area. Harjunpää gets a new partner, Onerva Nykänen.

When two of the victims of the stalker die, Harjunpää and Nykänen are spurred on to catch the perpetrator. The lonely and desperate ambulance driver dwells in misogyny and plans vengeance.

Young boys, hardened by their tough home lives, end up committing crimes. Harjunpää is called to examine a water body, who turns out to be a victim of an assault, and is still alive.

The young boys who see mentors in professional criminals and freestyle wrestlers continue their path of crime and violence. A discovery of a second body leads Harjunpää and Nykänen to a heartbreaking conclusion to the case.

The mental health of a start-up-millionaire gets shaken by identity theft. Harjunpää and Nykänen are assigned to the case which confuses them, as the thief's objective appears to be creating mischief.

The millionaire feels the pressure from the hackers and slowly loses his mind. A blackmail message arrives from the mischief-makers, and the victim decides to take the law into his own hands.