During the remainder of the evening this extraordinary case occupied my thoughts to the exclusion of almost everything else. I made up my mind to take it up, to set every inquiry on foot, and, above all things, to ascertain if there was a physical reason for the apparition's appearance; in short, if Mr. Sherwood's awful death was for the benefit of any living person. But I must confess that, think as I would, I could not see the slightest daylight until I remembered the curious expression of De Castro's face when he spoke of his appointment with a lady.