"Yes, sir," he answered quickly; and I was about to ring the bell before me, when the door opened and a young German girl, courtesying slightly, welcomed me in, saying: "Mrs. Warner is up-stairs, sir; in the front room, if you please." Not doubting her, but greatly astonished at the barren aspect of the place I was in, I stumbled up the faintly lighted stairs before me and entered the great front room. It was empty, but through an open door at the other end I heard a voice saying: "He has come, madam"; and anxious to see my patient, whose presence in this desolate house I found it harder and harder to understand, I stepped into the room where she presumably lay. Alas! for my temerity in doing so; for no sooner had I crossed the threshold than the door by which I had entered closed with a click unlike any I had ever heard before, and when I turned to see what it meant, another click came from the opposite side of the room, and I perceived, with a benumbed sense of wonder, that the one person whose somewhat shadowy figure I had encountered on entering had vanished from the place, and that I was shut up alone in a room without visible means of egress. This was startling, and hard to believe at first, but after I had tried the door by which I had entered and found it securely locked, and then bounding to the other side of the room, tried the opposite one with the same result, I could not but acknowledge I was caught. What did it mean? Caught, and I was in haste, mad haste. Filling the room with my cries, I shouted for help and a quick release, but my efforts were naturally fruitless, and after exhausting myself in vain I stood still and surveyed, with what equanimity was left me, the appearance of the dreary place in which I had thus suddenly become entrapped. CHAPTER II. It was a small square room, and I shall not soon forget with what a foreboding shudder I observed that its four blank walls were literally unbroken by a single window, for this told me that I was in no communication with the street, and that it would be impossible for me to summon help from the outside world. The single gas jet burning in a fixture hanging from the ceiling was the only relief given to the eye in the blank expanse of white wall that surrounded me; while as to furniture, the room could boast of nothing more than an old-fashioned black-walnut table and two chairs, the latter cushioned, but stiff in the back and generally dilapidated in appearance. The only sign of comfort about me was a tray that stood on the table, containing a couple of bottles of wine and two glasses. The bottles were full and the glasses clean, and to add to this appearance of hospitality a box of cigars rested invitingly near, which I could not fail to perceive, even at the first glance, were of the very best brand.