"I led the way to the Armory. Here I suggested that he should take one side of a dummy, dressed in half plate armor, whilst I took the other. He nodded, though obviously vastly bewildered, and together we carried the thing to the Chapel door. When he saw me take out my key and open the way for us he appeared even more astonished, but held himself in, evidently waiting for me to explain. We entered the Chapel and I locked the door behind us, after which we carted the armored dummy up the aisle to the gate of the chancel rail where we put it down upon its round, wooden stand. "'Stand back!' I shouted suddenly as young Jarnock made a movement to open the gate. 'My God, man! you mustn't do that!' "Do what?" he asked, half-startled and half-irritated by my words and manner. "One minute," I said. "Just stand to the side a moment, and watch." He stepped to the left whilst I took the dummy in my arms and turned it to face the altar, so that it stood close to the gate. Then, standing well away on the right side, I pressed the back of the thing so that it leant forward a little upon the gate, which flew open. In the same instant, the dummy was struck a tremendous blow that hurled it into the aisle, the armor rattling and clanging upon the polished marble floor. "Good God!" shouted young Jarnock, and ran back from the chancel rail, his face very white. "Come and look at the thing," I said, and led the way to where the dummy lay, its armored upper limbs all splayed adrift in queer contortions. I stooped over it and pointed. There, driven right through the thick steel breastplate, was the 'waeful dagger.' "Good God!" said young Jarnock again. "Good God! It's the dagger! The thing's been stabbed, same as Bellett!" "Yes," I replied, and saw him glance swiftly toward the entrance of the Chapel. But I will do him the justice to say that he never budged an inch. "Come and see how it was done," I said, and led the way back to the chancel rail. From the wall to the left of the altar I took down a long, curiously ornamented, iron instrument, not unlike a short spear. The sharp end of this I inserted in a hole in the left-hand gatepost of the chancel gateway. I lifted hard, and a section of the post, from the floor upward, bent inward toward the altar, as though hinged at the bottom. Down it went, leaving the remaining part of the post standing. As I bent the movable portion lower there came a quick click and a section of the floor slid to one side, showing a long, shallow cavity, sufficient to enclose the post. I put my weight to the lever and hove the post down into the niche. Immediately there was a sharp clang, as some catch snicked in, and held it against the powerful operating spring.