“You had better patronize Simpkins yourself for a little while,” I suggested; and by the arch glance with which my words were received, I perceived that my meaning was fully understood. Experiencing from this moment an increased confidence, not only in the powers of my little friend, but in the line of investigation thus happily established, I cast about for means of settling the one great question which was a necessary preliminary to all future action: Whether the marks detected by me in the dust of the mantel in the southwest chamber had been made by the hand of him who had lately felt the need of candles, albeit his house appeared to be fully lighted by gas? The subterfuge by which, notwithstanding my many disadvantages, I was finally enabled to obtain unmistakable answer to this query was the fruit of much hard thought. Perhaps I was too proud of it. Perhaps I should have mistrusted myself more from the start. But I was a great egotist in those days, and reckoned quite above their inherent worth any bright ideas which I could safely call my own. The point aimed at was this: to obtain without Moore’s knowledge an accurate impression of his finger-tips. The task presented difficulties, but these served duly to increase my ardor. Confiding to the lieutenant of the precinct my great interest in the mysterious house with whose suggestive interior I had made myself acquainted under such tragic circumstances, I asked him as a personal favor to obtain for me an opportunity of spending another night there. He was evidently surprised by the request, not cherishing, as I suppose, any great longings himself in this direction; but recognizing that for some reason I set great store on this questionable privilege,—I do not think that he suspected in the least what that reason was,—and being, as I have intimated, favorably disposed to me, he exerted himself to such good effect that I was formally detailed to assist in keeping watch over the premises that very night. I think that it was at this point I began to reckon on the success which, after many failures and some mischances, was yet to reward my efforts.