While Kari obsesses over a string of twisted murders, Lena contends with ghosts from her old life in Russia -- and both find their families in danger.

1. Five Finger Exercise (Part One) 60m When a mother and her son are shot dead in a car, her abusive ex seems like the obvious culprit. But Kari and Lena suspect there's more to the crime.

2. Five Finger Exercise (Part Two) 61m Evidence found at the second murder scene sends Lena back to Russia to confront someone from her past. Katia receives an unexpected visitor.

3. The Rite of Spring (Part One) 59m Kari struggles to figure out what the manager of a day care center is hiding when she refuses to answer questions about a fetus found in her basement.

4. The Rite of Spring (Part Two) 60m With Susanna's past revealed, the case seems solved, but Kari can't shake the feeling that he's missing something. Janina makes a troubling discovery.

5. Cat’s Cradle (Part One) 58m Kari takes time off to focus on Pauliina, but he's distracted by news of a sniper attack. Niko cracks under the pressure of leading his first case.

6. Cat’s Cradle (Part Two) 60m The third shooting leaves Janina in shock and turns the city into a ghost town. Kari redoubles his efforts to find a link between the victims.

7. The Bloodmaid (Part One) 60m A young video blogger's grisly discovery in her new apartment spurs the team to reopen a missing-person cold case. Kari plans a party for Pauliina.

8. The Bloodmaid (Part Two) 60m Laura receives an anonymous delivery and realizes someone is watching her every move. Kari develops a disturbing theory about the killer.

9. Without a Shadow (Part One) 60m When the sons of slain lawyer Seppo Laakkonen drop in on the Sorjonens at home, a plea for help soon spirals into a hostage situation.