"Suppose you were taking a walk in the dense fog of a London afternoon. Suppose a beautiful girl came running desperately toward you, the sound of her pursuers echoing close behind her. Sinner or saint--would you have stopped to think? Not Mr. Pinkerton! `In here quick!' he whispered. And then it all began--the corpse with the knife in his back, the disappearance of the fabulous Hawtrey diamond, the strange events in the sinister house in Portman Square. It was a case for Inspector Bull of Scotland Yard and he solved it brilliantly--with the help of Mr. Pinkerton, of course. This is a mystery with the impact of a pistol shot, by an author who knows how to deliver thrills and chills the way you like them.