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Duchlan Castle is a gloomy, forbidding place in the Scottish Highlands. Late one night the body of Mary Gregor, sister of the laird of Duchlan, is found in the castle. She has been stabbed to death in her bedroom - but the room is locked from within and the windows are barred. The only tiny clue to the culprit is a silver fish's scale, left on the floor next to Mary's body. Inspector Dundas is dispatched to Duchlan to investigate the case. The Gregor family and their servants are quick - perhaps too quick - to explain that Mary was a kind and charitable woman. Dundas uncovers a more complex truth, and the cruel character of the dead woman continues to pervade the house after her death. Soon further deaths, equally impossible, occur, and the atmosphere grows ever darker.