"Above the altar hangs the 'waeful dagger,' as I had learned it was named. I fancy the term has been taken from an old vellum, which describes the dagger and its supposed abnormal properties. I took the dagger down, and examined it minutely and with method. The blade is ten inches long, two inches broad at the base, and tapering to a rounded but sharp point, rather peculiar. It is double-edged.

"The metal sheath is curious for having a crosspiece, which, taken with the fact that the sheath itself is continued three parts up the hilt of the dagger (in a most inconvenient fashion), gives it the appearance of a cross. That this is not unintentional is shown by an engraving of the Christ crucified upon one side, whilst upon the other, in Latin, is the inscription: 'Vengeance is Mine, I will Repay.' A quaint and rather terrible conjunction of ideas. Upon the blade of the dagger is graven in old English capitals: I WATCH. I STRIKE. On the butt of the hilt there is carved deeply a Pentacle.

"This is a pretty accurate description of the peculiar old weapon that has had the curious and uncomfortable reputation of being able (either of its own accord or in the hand of something invisible) to strike murderously any enemy of the Jarnock family who may chance to enter the Chapel after nightfall. I may tell you here and now, that before I left, I had very good reason to put certain doubts behind me; for I tested the deadliness of the thing myself.

"As you know, however, at this point of my investigation, I was still at that stage where I considered the existence of a supernatural Force unproven. In the meanwhile, I treated the Chapel drastically, sounding and scrutinizing the walls and floor, dealing with them almost foot by foot, and particularly examining the two tombs.

"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.