The instant I had said it I was convinced I had hit on the explanation, and that perhaps it was already too late. It seemed to me as I listened that I heard stealthy footsteps on the east porch, but there was so much shouting outside that it was impossible to tell. Liddy was on the point of retreat. “Very well,” I said, “then I shall go down alone. Run back to Mr. Halsey’s room and get his revolver. Don’t shoot down the stairs if you hear a noise: remember—I shall be down there. And hurry.” I put the candle on the floor at the top of the staircase and took off my bedroom slippers. Then I crept down the stairs, going very slowly, and listening with all my ears. I was keyed to such a pitch that I felt no fear: like the condemned who sleep and eat the night before execution, I was no longer able to suffer apprehension. I was past that. Just at the foot of the stairs I stubbed my toe against Halsey’s big chair, and had to stand on one foot in a soundless agony until the pain subsided to a dull ache. And then—I knew I was right. Some one had put a key into the lock, and was turning it. For some reason it refused to work, and the key was withdrawn. There was a muttering of voices outside: I had only a second. Another trial, and the door would open. The candle above made a faint gleam down the well-like staircase, and at that moment, with a second, no more, to spare, I thought of a plan. The heavy oak chair almost filled the space between the newel post and the door. With a crash I had turned it on its side, wedging it against the door, its legs against the stairs. I could hear a faint scream from Liddy, at the crash, and then she came down the stairs on a run, with the revolver held straight out in front of her. “Thank God,” she said, in a shaking voice. “I thought it was you.” I pointed to the door, and she understood. “Call out the windows at the other end of the house,” I whispered. “Run. Tell them not to wait for anything.” She went up the stairs at that, two at a time. Evidently she collided with the candle, for it went out, and I was left in darkness. I was really astonishingly cool. I remember stepping over the chair and gluing my ear to the door, and I shall never forget feeling it give an inch or two there in the darkness, under a steady pressure from without. But the chair held, although I could hear an ominous cracking of one of the legs. And then, without the slightest warning, the card-room window broke with a crash. I had my finger on the trigger of the revolver, and as I jumped it went off, right through the door. Some one outside swore roundly, and for the first time I could hear what was said.