After a mysterious message from local activist Sonja á Heyggi, who claims she is his daughter and that her life is now in danger, journalist Hannis Martinsson returns home to the Faroe Islands.

Karla comes across new evidence that makes her question everything. Hannis continues his investigation into his daughter's death and tries to piece together the clues Sonja left behind.

Hannis discovers a secret operation that reveals Sonja cannot have died the way and where the police claim she did. Meanwhile, Karla wants to publicly close Sonja's case.

With the help of Sonja's friend Jenny, Hannis devises a new plan to expose the police investigation. Meanwhile, Karla finally gets a breakthrough in the case that could change everything.

After Ragnar's last warning to Hannis, a new discovery reveals who the real culprit is. But without enough evidence, Hannis takes dramatic steps to catch Sonja's killer.