Cold Earth by Ann Cleeves

Cold Earth is the seventh book in the Shetland series, from Ann Cleeves, the number one bestselling author and creator of Vera, Shetland and the two rivers series. The seventh Shetland novel The darkest secrets are buried deepest… In the black days of a Shetland winter, torrential rain triggers a landslide that crosses the main road and sweeps down to the sea. At the burial of his old friend Magnus Tait, Jimmy perez watches the flood of peaty water and mud smash through a Croft house in its path. Everyone thinks the Croft is uninhabited, but in the wreckage he finds the body of a dark-haired woman wearing a red silk dress. Perez becomes obsessed with finding out her identity and what she was doing there.