A dedicated investigator, who is forced into early retirement, takes on a final cold case centred around a young Russian asylum seeker who died mysteriously one year ago.

Magnus assigns Hulda a new partner, Lukas, who she must take under her wing until she retires; Hulda is frustrated about her co-workers pushing her into retirement.

Elena is kidnapped by Katya's killer. Her son Rudi tells Hulda and Lukas he saw a big, red man when his mum was taken, and they realise that this must be connected to the sex trafficking ring.

When the case of the missing women is revealed, Hulda discovers the truth behind Dimma's death.

Lukas and Hulda's investigation progresses as they begin to delve into corruption.

After discovering who killed Katja, Hulda gets trapped with the killer.