ISBN-13: 9780712356237 / Angielski / Miękka / 2016 / 288 str.
Duchlan Castle is a gloomy, forbidding place in the Scottish Highlands. Late one night the body of Mary Gregor, is found in the castle, stabbed to death in her bedroom - but the room is locked from within and the windows are barred. The only clue to the culprit is a silver fish's scale, left on the floor next to Mary's body.