He went away into the darkness, and I sat down on an empty box by the window and waited. Had any one asked me, at that minute, how near we were to the solution of our double mystery, I would have said we had made no progress--save by eliminating Wardrop. Not for one instant did I dream that I was within less than half an hour of a revelation that changed my whole conception of the crime. I timed the interval by using one of my precious matches to see my watch when he left. I sat there for what seemed ten minutes, listening to the rush of the rain and the creaking of a door behind me In the darkness somewhere, that swung back and forth rustily in the draft from the broken windows. The gloom was infinitely depressing; away from Burton's enthusiasm, his scheme lacked point; his argument, that the night duplicated the weather conditions of that other night, a week ago, seemed less worthy of consideration. Besides, I have a horror of making myself ridiculous, and I had an idea that it would be hard to explain my position, alone in the warehouse, firing a revolver into the floor, if my own argument was right, and the club should rouse to a search. I looked again at my watch; only six minutes. Eight minutes. Nine minutes. Every one who has counted the passing of seconds knows how they drag. With my eyes on the room across, and my finger on the trigger, I waited as best I could. At ten minutes I was conscious there was some one in the room over the way. And then he came into view from the side somewhere, and went to the table. He had his back to me, and I could only see that he was a large man, with massive shoulders and dark hair. It was difficult to make out what he was doing. After a half-minute, however, he stepped to one side, and I saw that he had lighted a candle, and was systematically reading and then burning certain papers, throwing the charred fragments on the table. With the same glance that told me that, I knew the man. It was Schwartz. I was so engrossed in watching him that when he turned and came directly to the window, I stood perfectly still, staring at him. With the light at his back, I felt certain I had been discovered, but I was wrong. He shook the newspaper which had held the fragments, out of the window, lighted a cigarette and flung the match out also, and turned back into the room. As a second thought, he went back and jerked at the cord of the window-shade, but it refused to move. He was not alone, for from the window he turned and addressed some one in the room behind. "You are sure you got them all?" he said. The other occupant of the room came within range of vision. It was Davidson. "All there were, Mr. Schwartz," he replied. "We were nearly finished before the woman made a bolt." He was fumbling in his pockets. I think I expected him to produce an apple and a penknife, but he held out a small object on the palm of his hand.