“The wedges and the shred of linen are in the keeping of Superintendent Boyd, to whom I gave them at the time of my discovery. I could not, my case being incomplete, explain then their significance. “My next step was to question Deacon. To my surprise and consternation I found that although he was a man for whom tools had neither interest nor meaning and for whom therefore the handling of any such implement might be so much out of the ordinary as to impress itself upon his memory, he had no recollection of ever seeing, before the inquest, any wood-rasp. He even suggested that until now he had not known such a tool to exist. “I will not deny that Deacon’s emphatic assertion that he had never even seen the rasp until it was exhibited at the inquest gave me a shaking. It did, and a bad one. I tested all the links in my chain, only to find each sound and the whole most obviously right—until this blind alley. “Then it struck me, and I laughed at myself as those who read are probably already laughing at me. I saw that I was committing the grave error of underrating my man. I saw that so far from having received a check I had really been advanced. “The finger-prints were on the handle of the rasp, and the handle—had I not been at much pains to prove it—had been separated from the blade by the murderer. The murderer—being an intelligent murderer—would certainly never have been such a fool as to let the fearsome and so-likely-to-be-remembered blade within Deacon’s sight. No, it was far more likely that he had disguised the handle as the handle of something else. “Having got thus far, I progressed at speed. As what could he have disguised the handle? With efficacy, only as that of another tool. But he probably knew Deacon as a man who had no truck with tools. How, then, did he get the so-ordinary surroundings necessary to prevent awkward memories arising afterwards in the mind of Deacon? The answer is that they were there, ready-made, to his hand. In order to avoid obscurity, I will elucidate this. “The indication all through had been that the murderer was a man accustomed to the use of carpenter’s tools. The murderer was an inmate of the house. Put one and two together and you will see that he would very possibly be known to the household as one who was ‘always messing about at that there carpent’ring.’ Deacon was also of the household, and would therefore see nothing unusual in, say, being asked to ‘hold this chisel (or gouge, or anything else you like) for just half a second.’ If this seem far-fetched, remember that from the beginning I felt the murderer as one who had been preparing his work for some long time.