Detectives Sofia Karppi and Sakari Nurmi investigate two murders and their possible connection to an enormous construction project.

As Karppi grieves a painful loss, she and Nurmi search for the meaning behind a cryptic clue written in blood.

Karppi has a contentious conversation about her son. The mayor finds herself in danger, both politically and personally.

The police go on a frantic hunt for Iida while Henna struggles with a dangerous situation. A profile of the kidnapper comes into focus.

Karppi and Nurmi dig for answers in hopes the mayor is still alive. Henna's quest to wipe away a debt takes an alarming turn.

Henna makes a desperate call, Nurmi has a painful reunion with an ex-flame and Karppi comes face-to-face with an unwelcome visitor.

Karppi suspects there may be a deeper layer to the case, but not everyone agrees. Meanwhile, Henna makes a startling confession.

As Karppi and Nurmi put the final pieces together, they learn — perhaps too late — that the target of their pursuit won't go quietly.

When a woman is found in a cage brutally murdered, Karppi and Nurmi focus on learning everything they can about the victim — and her troubled son.

Fueled by desperation, Ossi makes a move. Karppi receives an intriguing call about her late husband. Nurmi has a brief — but painful — reunion.

Karppi's case takes a turn when human remains are found in the sewer. Nurmi visits Laura in the hospital. Henna faces heat from all sides.

While searching for a missing suspect, Karppi and Nurmi make another grisly discovery. A cryptic clue hints at the killer's motive.

Karppi and Nurmi investigate if a teen's overdose is connected to their case. Henna goes snooping. Karppi chases a lead in her husband's death.

Now on the run from the police, Karppi fights to continue her investigation. A terrified Henna finds herself in mortal danger.

An unexpected encounter leads to more clues about Karppi's husband. The detectives unravel a common thread among the victims.

Karppi and Nurmi track the suspect to the ruins of an old convent, where they discover that the case is anything but over.