"At the end of this search, I had in a ladder, and made a close survey of the groined roof. I passed three days in this fashion, and by the evening of the third day I had proved to my entire satisfaction that there is no place in the whole of that Chapel where any living being could have hidden, and also that the only way of ingress and egress to and from the Chapel is through the doorway which leads into the castle, the door of which was always kept locked, and the key kept by Sir Alfred Jarnock himself, as I have told you. I mean, of course, that this doorway is the only entrance practicable to material people. "Yes, as you will see, even had I discovered some other opening, secret or otherwise, it would not have helped at all to explain the mystery of the incredible attack, in a normal fashion. For the butler, as you know, was struck in full sight of the Rector, Sir Jarnock and his son. And old Bellett himself knew that no living person had touched him.... _'Out of the Void,'_ the Rector had described the inhumanly brutal attack. 'Out of the Void!' A strange feeling it gives one--eh? "And this is the thing that I had been called in to bottom! "After considerable thought, I decided on a plan of action. I proposed to Sir Alfred Jarnock that I should spend a night in the Chapel, and keep a constant watch upon the dagger. But to this, the old knight--a little, wizened, nervous man--would not listen for a moment. He, at least, I felt assured had no doubt of the reality of some dangerous supernatural Force a roam at night in the Chapel. He informed me that it had been his habit every evening to lock the Chapel door, so that no one might foolishly or heedlessly run the risk of any peril that it might hold at night, and that he could not allow me to attempt such a thing after what had happened to the butler. "I could see that Sir Alfred Jarnock was very much in earnest, and would evidently have held himself to blame had he allowed me to make the experiment and any harm come to me; so I said nothing in argument; and presently, pleading the fatigue of his years and health, he said goodnight, and left me; having given me the impression of being a polite but rather superstitious, old gentleman. "That night, however, whilst I was undressing, I saw how I might achieve the thing I wished, and be able to enter the Chapel after dark, without making Sir Alfred Jarnock nervous. On the morrow, when I borrowed the key, I would take an impression, and have a duplicate made. Then, with my private key, I could do just what I liked.