Virus investigation becomes even more topical. Police track down the fourth victim.

Nina gets a chance to interrogate the fourth woman. Esko gets into trouble with the police. The first victim wakes up from coma.

Nina and Thomas are in danger when Raunola returns to Ivalo. Marita gets bad news in quarantine.

Nina and Thomas get new information from a surprising source. Thomas has to fight for his daughter's custody. Virus infection takes a frightening turn.