“I want you to come with me, Liddy,” I said.  “Bring a candle and a couple of blankets.”

She lagged behind considerably when she saw me making for the east wing, and at the top of the staircase she balked.

“I am not going down there,” she said firmly.

“There is no one guarding the door down there,” I explained.  “Who knows?—­this may be a scheme to draw everybody away from this end of the house, and let some one in here.”

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  For some reason it refused to work, and the key was withdrawn.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.