Siglufjoerdur: an idyllically quiet fishing village on the northernmost tip of Iceland, accessible only via a small mountain tunnel.

Ari Thor Arason: a local policeman, whose tumultuous past and uneasy relationships with the villagers continue to haunt him.

The peace of this close-knit community is shattered by the murder of a policeman - shot at point-blank range in the dead of night in a deserted house. With a killer on the loose and the dark arctic winter closing in, it falls to Ari Thor to piece together a puzzle that involves tangled local politics, a compromised new mayor and a psychiatric ward in Reykjavik, where someone is being held against their will.

Then a mysterious young woman moves to the area, on the run from something she dare not reveal, and it becomes all too clear that tragic events from the past are weaving a sinister spell that may threaten them all.