“These were so evidently accomplices that I wondered if the two sly boys I had engaged to stand by me through this affair had spotted them, and would know enough to follow them back to their haunts. “A few minutes later, the old rascal came sneaking towards me, with a gleam of satisfaction in his half-closed eyes. “‘You are not wanted any longer,’ he grunted. ‘The young gentleman told me to say that he could look out for himself now.’ “‘The young gentleman had better pay me the round fifty he promised me,’ I grumbled in return, with that sudden change from indifference to menace which I thought best calculated to further my plans; and shouldering the miserable wretch aside, I stepped up to my companion, who was still lingering in a state of hesitation among the gravestones. “‘Quick! Tell me the number and street which he has given you! ‘I whispered, in a tone strangely in contrast with the angry and reproachful air I had assumed. “He was about to answer, when the old fellow came sidling up behind us. Instantly the young man before me rose to the occasion, and putting on an air of conciliation said in a soothing tone: “‘There, there, don’t bluster. Do one thing more for me, and I will add another fifty to those I promised you. Conjure up an anonymous letter--you know how--and send it to my father, saying that if he wants to know where his son loses his hundreds, he must go to the place on the dock, opposite 5 South Street, some night shortly after nine. It would not work with most men, but it will with my father, and when he has been in and out of that place, and I succeed to the fortune he will leave me, then I will remember you, and----’ “‘Say, too,’ a sinister voice here added in my ear, ‘that if he wishes to effect an entrance into the gambling den which his son haunts, he must take the precaution of tying a bit of blue ribbon in his button-hole. It is a signal meaning business, and must not be forgotten,’ chuckled the old fellow, evidently deceived at last into thinking I was really one of his own kind. “I answered by a wink, and taking care to attempt no further communication with my patron, I left the two, as soon as possible, and went back to the hotel, where I dropped ‘the sport,’ and assumed a character and dress which enabled me to make my way undetected to the house of my young patron, where for two days I lay low, waiting for a suitable time in which to make my final attempt to penetrate this mystery. “I knew that for the adventure I was now contemplating considerable courage was required. But I did not hesitate. The time had come for me to show my mettle. In the few communications I was enabled to hold with my superiors I told them of my progress and arranged with them my plan of work. As we all agreed that I was about to encounter no common villainy, these plans naturally partook of finesse, as you will see if you will follow my narrative to the end.