When an elderly woman is shot in what appears to be a tragic accident, Shetland detective Jimmy Perez is called to investigate the mystery. The sparse landscape and the emptiness of the sea have bred a fierce and secretive people. As Jimmy looks to the islanders for answers, he finds instead two feuding families whose envy, greed and bitterness have lasted generations. Then there's another murder and, as the spring weather shrouds the island in claustrophobic mists, Jimmy must dig up old secrets to stop a new killer from striking again . . .