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.
Two exchange students in a coastal Norwegian town decide to hike outside to chase the Northern Lights but soon find out they are not alone under the auroras
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.
