Together we descended the fine staircase, brilliantly lit by a huge chandelier of crystal and hung with large time-mellowed paintings, into a spacious hall, in which a footman with powdered hair awaited us. Half dazed, my senses not having recovered from the shock caused to them, first by the charcoal fumes and secondly by the appalling discovery of Sybil’s death, I remember that when the flunkey threw open the door a hansom was awaiting me, and that my strange companion himself gave the cabman my address. I have also a distinct recollection of having refused to grasp my enemy’s proffered hand, but it was not until I found myself seated alone before the dying embers of the fire in my chambers in Shaftesbury Avenue, my mind troubled to the point of torment, that it suddenly occurred to me that in leaving the mysterious mansion I had been culpably negligent of the future. I had actually failed to take notice either of the exterior of the house, or of the thoroughfare in which it was situated! I had, I knew, driven along Oxford Street eastward to Regent Street, and thence home, but from what direction the conveyance had approached the Marble Arch I knew not. In blank despair I paced my room, for I saw I should be compelled to search London for a house, of which all I knew of the exterior was that it had a wide portico in front and was approached from the pavement by three steps. My omission to take notice of its aspect overwhelmed me with despair, for there were thousands of similar houses in the West-End, and I knew that, while I prosecuted my inquiries, those responsible for Sybil’s death would be afforded ample time to effect their escape. That such a search was beset with difficulty I was well aware. But nervousness gave way to determination, at once feverish and fixed, and it was in a mood of perfect self-mastery that, after a long period of mental conflict, I flung myself upon my couch with my plan of operations clearly laid out, and lay thinking over them until the yellow light of the wintry dawn struggled in between the curtains. Chapter Four. A Deepening Mystery. As the cheerless morning wore on, I sat after breakfast gloomily smoking, trying to verify my first impression that Sybil had been the victim of foul play in the hope of dispelling it. But it was, on the contrary, deepened. Either I was wrong to think thus; and at any price I was determined to convince