When a young archaeologist studying on a site at Whalsay discovers a set of human remains - the island community is intrigued. Is it an ancient find - or a more contemporary mystery? Then in the middle of the night, an elderly is shot in a tragic accident. Shetland detective Jimmy Perez is called in to investigate by her grandson - his own colleague, Sandy Wilson. The sparse landscape and the emptiness of the sea have bred a fierce and secretive people. Mima Wilson was a recluse. She had her land, her pride and her family. When Jimmy looks to the local community for answers he finds instead two feuding families whose envy, greed and bitterness have lasted generations. Surrounded by people he doesn't know and in unfamiliar territory, Perez finds himself out of his depth. Then there's another death and, as spring weather shrouds the island in claustrophobic mists, Jimmy must dig up old secrets to stop a new killer from striking again.