had twice before attracted my attention if not my keenest interest; for I was still more interested in my troubles than in those of some unknown female of this alien race.

And a moment later my fingers came in contact with something that drove all thoughts of screaming women from my mind. By feel, it was the frame of a door or of a window. With both hands I examined my find. Yes, it was a door! It was a narrow door about six feet in height.

I felt the hinges; I searched for a latch—and at last I found it. Cautiously I manipulated it and presently I felt the door move toward me.

What lay beyond? Some new and fiendishly conceived form of death or torture, perhaps; perhaps freedom. I could not know without opening that portal of mystery.

I hesitated, but not for long. Slowly I drew the door toward me, an eye close to the widening crack. A breath of night air blew in upon me; I saw the faint luminosity of a Venusan night.

Could it be possible that with all their cunning the Thorists had inadvertently left this avenue of escape from this lethal chamber? I could scarcely credit it, yet there was naught that I could do but go on and chance whatever lay beyond.

I opened the door and stepped out upon a balcony which extended in both directions until it passed from the range of my vision beyond the curve of the circular wall to which it clung.

At the outer edge of the balcony was a low parapet behind which I now crouched while I reconnoitered my new situation. No new danger seemed to threaten me, yet I was still suspicious. I moved cautiously forward upon a tour of investigation, and again an agonized scream rent the silence of the night. This time it seemed quite close; previously, the walls of the building in which I had been imprisoned had muffled it.

I was already moving in the direction of the sound, and I continued to do so. I was searching for an avenue of descent to the ground below, not for a damsel in distress. I am afraid that at that moment I was callous and selfish and far from chivalric; but, if the truth be known, I would not have cared had I known that every inhabitant of Kapdor, male and female, was being destroyed.

Rounding the curve of the tower, I came in sight of another building standing but a few yards distant; and at the same instant I saw something that greatly aroused my interest and even my hope. It was a narrow causeway leading from the balcony on which I stood to a 

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