Introduction

Inspector Macdonald sat with his chin on his hands and his great sandy eyebrows bunched into a yellow tangle. The papers will be full of the burlstone mystery in a day or two, cried the inspector. But where's the mystery? If there is a man in london who prophesied the crime before it ever occurred, we have only to lay our hands on that man and the rest will follow,. no doubt, mister mack.