I did not feel like making myself known to them. They might take me, perhaps, as Harry's coöperator, and so I silently watched them leave. Turning the matter over in my mind a moment, I resolved upon the best course to pursue. Harry must be come upon that night if I were to succeed with him, I saw. I had known his lodging-room three months before, but had heard he had changed quarters; where to hunt him was the point. I bethought me of a boarding-house keeper in West 13th Street, with whom Harry once boarded, and who, not knowing his real character, had great respect for him, and whom, too, Harry evidently really respected, for I had been told that he always spoke of her in terms of admiration. I fancied she would be as apt as any one to know where were his quarters, and I took a carriage, and drove immediately to her house. Fortunately she was at home; and on inquiring of her if she could tell me where I could find Mr. Dubois the next morning, for I did not let her know my haste, she said that she guessed I'd be most apt to find him in his office in Pine Street, No. 34; that he had applied to her for board two days before, with which she could not accommodate him for a week or so to come; so he said he would sleep on a lounge in his office, and take his meals out till she could give him quarters, and that the day before he sent up for blankets, with which she had supplied him. My plan was complete. Hurrying away from her house, I ordered the driver to push straight for my rooms, where, arming myself completely, I drove on as far as the post office, when, ordering the driver to await my return, I alighted, and proceeded to 34 Pine Street. As it chanced, next door was the office of my friend, the late Simeon Draper, and I was not a little pleased to find a light there, and one of his clerks and another man looking over some papers, as I saw through the window. Tapping on the door, it was readily unlocked, and I said to the clerk, who recognized me, "No questions asked; but let _me_ inquire if you are going to be here for fifteen minutes longer?" [Illustration: RECOVERING THE DIAMOND RING.] "Yes, for an hour, perhaps." "Well, I may call again." "Do so--are you after a 'bird'?" asked the clerk, with a knowing wink in his eye; for he very quickly divined that I was on some detective mission; for Mr. Draper had been a frequent patron of mine, and often sent this clerk to me on business. I closed the door, and ran up two flights of stairs to "Dubois's" room, and immediately rapped upon the door. No noise within--all silence! Had the bird flown? I thought not. I believed he was there. Again I rapped. "Who's there?" asked a half-sleepy voice.