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.

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 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.

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.