Iceland 1940. Britain invades Iceland. Lieutenant Tom Marks is a British officer tasked with defending Whale Fjord. He meets Kristín, a young widow from a nearby farm, who has a small son. Tom is smitten. Iceland 2023. Inspector Magnus Ragnarsson is called to the shores of Whale Fjord where the skeletons of a man and a woman have been discovered, both shot with British wartime bullets. Magnus uncovers a web of anger and revenge that stretches back eighty years and forward to a shocking murder in Reykjavík.