Just as Hulda discovers who killed Katja and kidnapped Elena, she finds herself trapped with the killer, forced to make a decision when she realizes that her captor and killer may never be caught.

As the case of the two missing women unfolds, Hulda discovers the tragic truth behind Dimma's death; faced with the undeniable, she decides to take the ultimate retribution.

Frustrated by the arrival of a new partner, Lukas, Hulda wades through the complex and corrupt world of refugees in Iceland to uncover a possible prostitution ring.

When another victim goes missing, Hulda and Lukas must work fast to unravel the link between the two cases; Dimma's best friend reveals a shocking revelation about Hulda's family.

Lukas and Hulda’s investigation gathers pace as they dig deeper into political and legal corruption; closing in on the killer, a previous indiscretion comes back to bite Hulda.

As Hulda unwillingly approaches retirement, a year after the unexpected death of her daughter Dimma, she is faced with a case of a missing woman that consumes her entirely.