The mysterious appointment puzzled me, but after spending a very cheerless day, I hailed a taxi-cab at eight o'clock and set forth for Chiswick, a district to which I had never before been. At length we found ourselves outside an old-fashioned church, and on inquiry I was told by a boy that Bishop's Lane was at the end of a footpath which led through the churchyard. I therefore dismissed the taxi, and after some search, at length found No. 4A, an old-fashioned house standing alone in the darkness amid a large garden surrounded by high, bare trees--a house built in the long ago days before Chiswick became a London suburb. As I walked up the path the door was opened, and I found the old man Van Nierop standing behind it. Without a word he ushered me into a back room, which, to my surprise, was carpetless and barely furnished. Then he said, in that strange croaking voice of his: "Your master will be here in about a quarter of an hour. He's delayed. Have a cigarette." I took one from the packet he offered, and still puzzled, lit it and sat down to await the Baron. The old man had shuffled out, and I was left alone, when of a sudden a curious drowsiness overcame me. I fancy there must have been a narcotic in the tobacco, for I undoubtedly slept. When I awoke I found, to my amazement, that I could not use my arms. I was still seated in the wooden arm-chair, but my arms and legs were bound with ropes, while the chair itself had been secured to four iron rings screwed into the floor. Over my mouth was bound a cloth so that I could not speak. Before me, his thin face distorted by a hideous, almost demoniacal laugh of triumph, stood old Van Nierop, watching me as I recovered consciousness. At his side, grinning in triumph, was my master, the Baron. I tried to ask the meaning of it all, but was unable. "See, see!" cried the old Dutchman, pointing with his bony finger to the dirty table near me, whereon a candle-end was burning straight before my eyes beside a good-sized book--a leather-bound ledger it appeared to be. "Do you know what I intend doing? Well, I'm going to treat you as all English spies should be treated. That candle will burn low in five minutes and sever the string you see which joins the wick. Look what that innocent-looking book contains!" and with a peal of discordant laughter he lifted the cover, showing, to my horror, that it was a box, wherein reposed a small glass tube filled with some yellow liquid, a trigger held back by the string, and some square packets wrapped in oiled paper. "You see what this is!" he said slowly and distinctly. "The moment the string is burned through, the hammer will fall, and this house will be blown to atoms. That book contains the most powerful explosive known to science." I could not demand an explanation, for though I struggled, I could not speak. I watched the old man fingering with fiendish delight the terrible machine he had devised for my destruction.