The creak on the stairs

When a body of a woman is discovered at a lighthouse in the Icelandic town of Akranes, it soon becomes clear that she's no stranger to the area. Chief Investigating Officer Elma, who has returned to Akranes following a failed relationship, and her collegues Sævar and Hördur, commence an uneasy investigation, which uncovers a shocking secret in the dead woman's past that continues to reverberate in the present day.