Ivalo

Nina lives in Rovaniemi due to Venla's school and her mother's cancer. A former hockey player once accused of murdering his wife disappears. Irina, a prostitute previously rescued by Nina, is contacted.

Irina's murder makes Nina join the new Finland-Russia police unit. Nina travels to Murmansk with her new partner Viktor. The International Secret Society is preparing to start the hunting week.

The tailbone found by Nina and Viktor leads them to the desert, where they end up witnessing a human hunt. However, the police are caught. The director of the secret society invites them to dinner.

Nina and Viktor manage to escape from the monastery. Nina promises to return to Kajante. Russian police lead promises to arrest hunters. Nina is shelved because she had left for Murmansk without permission.

Nina and Viktor investigate the murder of the old Lahti, because only by proving that Kajanne did not murder his wife, Nina believes that it is possible to save her from Ordo's captivity. Nina gets to know her father.

Nina drives back to the monastery with her father. Dad tells Nina what happened when Aava died. After reaching the monastery, a surprising turn forces Nina to save Kajante personally.

Finnish police Nina Kautsalo makes a horrific discovery in the basement of wilderness cabin. Soon the find brings German virologist, Thomas Lorenz, to work on the case.

National Bureau of Investigation joins the investigation and Nina is forced off the case. Tracks in the snow give her a new lead, however.

Raunola, the man suspected for the murders is leaving the investigators confused. The virus investigation takes a bad turn, and Nina and Thomas find each other in surprising place.

Both crime and virus investigations are progressing slowly. Work and personal life are starting to mix for both Nina and Thomas.

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.

Nina and Thomas participate in an illegal expedition to Murmansk. Venla is fighting for her life.

Nina and Thomas return to Finland. Venla gets help from unexpected source. Nina will have to step into the darkness once more.