Ilmari is escaping snowy Finland to go skateboarding in Barcelona, but a quiet evening at a house party escalades into misunderstandings, arguments and too many “second opinions”.

Iiris tries to recover from her difficult separation with Artturi when she unexpectedly meets Anton. The relationship doesn't get a chance to progress far when Iiris' son Niilo suddenly becomes ill. Niilo would only need a small operation, but once the boy enters the operating room, the hospital is subjected to a cyber attack. The power is cut off, the ventilators stop working and all access to patient data is blocked. Nurses have to prioritize whose life is the most valuable.

A mural painted with blood is found on the wall of Pasila train station, which depicts Finland's best-known serial killer Lasse Maasalo. The text in the mural, “Making the world a better place”, is linked to a voting circulating in social media, where people can vote for persons that world would be a better place without. Soon the first body is found and Sorjonen must find the person who has named himself as The Judge.