Journalist Hannis Martinsson receives a mysterious message from a local activist claiming to be his daughter and saying her life is in danger; he returns home to the Faroe Islands, where her dead body surfaces during a local whale hunt.

As the mystery around Sonja deepens, detective Karla Mohr works fast to settle down Hannis and her superiors, as well as the local community; a rattled Hannis begins his own investigation.

Karla encounters new evidence that makes her question everything; Hannis continues his investigation into his daughter's death and tries to gather the clues that Sonja left behind.

Hannis discovers a secret operation that reveals that Sonja could not have died in the way the police claim she did; at the same time, Karla goes public to end Sonja's case.

With the help of Sonja's friend, Jenny, Hannis devises a new plan to expose the police investigation; at the same time, Karla finally gets a breakthrough in the case, which can change everything.

After Ragnar's last warning to Hannis, a new discovery reveals who the true perpetrator is; when he doesn't have enough evidence, Hannis takes drastic steps to catch the killer.