36," he said to the policeman. "I want it done at once. Get a glazier and go up there and have it finished in an hour. Mrs. Kenna, caretaker at No. 36, is in my pay; she will not interfere. There is nobody in No. 38: Mr. Kerns leaves there to-night and the Burglar Alarm Company takes charge tomorrow."

And, turning to the others: "You," nodding at the reformed burglar, "know your duty. Mike!" to the cab driver, "don't miss Mr. Kerns at the Lenox Club. If he calls you before eleven, drive into the park and have an accident. And you," to the agent of the telephone company, "will sever all telephone connection in Mrs. Stanley's house; and you," to the official of the electric company, "will see that the circuit in Mrs. Stanley's house is cut so that no electric light may be lighted and no electric bell sound."

The Tracer of Lost Persons stroked his gray mustache thoughtfully. "And that," he ended, "will do, I think. Good night."

He rose and stood by the door as the policeman headed the solemn file which marched out to their duty; then he looked at his watch, and, as it was already a few minutes after eight, he called up No. 36 East Eighty-third Street, and in a moment more had Mrs. Stanley on the wire.

"Good evening," he said pleasantly. "I suppose you have just arrived from Rosylyn. I may be a little late--I may be very late, in fact, so I called you up to say so. And I wished to say another thing; to ask you whether your servants could recollect ever having seen a young man about the place, a rather attractive young man with excellent address and manners, five feet eleven inches, slim but well built, dark hair, dark eyes, and dark mustache, offering samples of Georgia marble for sale."

"Really, Mr. Keen," replied a silvery voice, "I have heard them say nothing about such an individual. If you will hold the wire I will ask my maid." And, after a pause: "No, Mr. Keen, my maid cannot remember any such person. Do you think he was a confederate of that wretched butler of mine?"

"I am scarcely prepared to say that; in fact," added Mr. Keen, "I haven't the slightest idea that this young man could have been concerned in anything of that sort. Only, if you should ever by any chance see such a man, detain him if possible until you can communicate with me; detain him by any pretext, by ruse, by force if you can, only detain him until I can get there. Will you do this?"Certainly, Mr. Keen, if I can. Please describe him again?" Mr. Keen did so minutely. "You say he sells Georgia marble by 

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