I was congratulating myself upon my good fortune as I was about to turn into the transverse corridor, when I bumped full into a figure at the turn.

It was a woman. She was probably much more surprised than I, and she started to scream.

I knew that, above all things, I must prevent her from giving an alarm; and so I seized her and clapped a hand across her mouth.

I had just turned the corner into the other corridor when I collided with her; its full length was visible to me; and now, as I silenced the woman, I saw two warriors turn into it at the far end. They were coming in my direction.

Evidently I had congratulated myself too soon.

Unencumbered by my captive, I might have found a hiding-place, or, failing that, I could have lain in ambush for them in this darker passageway and killed them both before they could raise an alarm; but here I was with both of my hands occupied, one of them holding the struggling girl and the other effectually silencing her attempt to cry out.

I could not kill her, and if I turned her loose she would have the whole castle on me in a few moments. My case seemed entirely hopeless, but I did not give up hope. I had come this far; I would not, I could not, admit defeat.

Then I recalled the two doors that I had passed in the short corridor. One of them was only a few paces to my rear.

"Keep still, and I will not harm you," I whispered, and then I dragged her along the corridor to the nearest door.

Fortunately, it was unlocked; but what lay beyond it, I did not know. I had to think quickly and decide what I should do if it were occupied. There seemed only one thing to do, push the girl into it and then run back to meet the two warriors that I had seen approaching. In other words, try to fight my way out of the castle of Ul Vas—a mad scheme, with half a thousand warriors to block my way.

But the room was not occupied, as I could see the moment that I entered it; for it was well lighted by several windows.

Closing the door, I stood with my back against it, listening. I had not looked down at the woman in my arms; I was too intent upon listening for the approach of the two warriors I had seen. Would they turn into this corridor? Would they come to this very room?

I must have unconsciously released my pressure upon the girl's lips; for before I could prevent it, she tore my hand away and spoke.

"John Carter!" she exclaimed in a low tone.

I looked down at her in surprise, and then I recognized her. It was Ulah, the slave of Ozara, the Jeddara of the Tarids.

"Ulah," I said, earnestly, "please do not make me harm you. I do not wish to harm anyone in the castle; I only wish to escape. More than my life depends upon that, so very much more that I would break the unwritten law of my caste even to killing a woman, were it necessary to do so to accomplish my purpose."