A gloomy, foboding castle in the Scottish Highlands and a sister of the laid stabbed to death in her bedroom... but the room is locked from the inside and the windows are barred. The only clue next to Mary Gregor's body is a silver fish scale.
Inspector Dundas is quickly dispatched to Duchlan Castle to investigate the case. The Gregor family and their servants are almost too quick to explain that Mary was a kind and charitable woman, and Dundas soon uncovers a much more complex truth.
Anthony Wynne is the author of some of the best locked-room mysteries from the golden age of crime fiction. This cunningly plotted novel - one of Wynne's finest - has never been reprinted since 1931 and is long overdue for rediscovery.