Three doors we passed, two upon the left and one upon the right. We tried them all. All were unfastened, and the rooms into which they opened bare and deserted. Then we came upon a short, descending stair, at its foot a massive oaken door.
Carneta glided down, noiseless as a ghost, and to one of the blackened panels applied an ingenious little instrument which she carried in her knapsack. It was not unlike a stethoscope; and as I watched her listening, by means of this arrangement, for any sound beyond the oaken door, I reflected how almost every advance made by science places a new tool in the hand of the criminal.
No word had been spoken since we had discovered this door; none had been necessary. For we both knew that the place beyond was that from which proceeded the mysterious red light.
I directed the ray of the electric torch upon Carneta, as she stood there listening, and against that sombre oaken background her face and profile stood out with startling beauty. She seemed half perplexed and half fearful. Then she abruptly removed the apparatus, and, stooping to the knapsack, replaced it and took out a bunch of wire keys, signing to me to hand her the lamp.
As I crept down the steps I saw her pause, glancing back over her shoulder toward the door. The expression upon her face induced me to direct the light in the same direction.
Why neither of us had observed the fact before I cannot conjecture; but a key was in the lock!
Perhaps the traffic of the night afforded no more dramatic moment than this. The house which we were come prepared burglariously to enter was thrown open, it would seem, to us, inviting our inspection!
Looking back upon that moment, it seems almost incredible that the sight of a key in a lock should have so thrilled me. But at the time I perceived something sinister in this failure of the Lord of the Hashishin to close his doors to intruders. That Carneta shared my doubts and fears was to be read in her face; but her training had been peculiar, I learned, and such as establishes a surprising resoluteness of character.
Quite noiselessly she turned the key, and holding a dainty pocket revolver in her hand, pushed the door open slowly!
An odour, sickly sweet and vaguely familiar, was borne to my nostrils. Carneta became outlined in dim, reddish light. Bending forward slightly, she entered the room, and I, with muscles tensed nervously, advanced and stood beside her.