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.

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.