I was not yet accustomed to my new and surprising state of invisibility. I could see the people about me and it seemed inevitable that I must be seen. For a moment I had hesitated in the doorway that had led me to the corridor. A slave girl, approaching along the corridor, turned suddenly toward the doorway where I stood. She was looking directly at me, yet her gaze appeared to pass entirely through me. For an instant I was filled with consternation, and then, realizing that she was about to collide with me, I stepped quickly to one side. She passed by me, but it was evident that she sensed my presence for she paused and looked quickly about, an expression of surprise in her eyes. Then, to my immense relief, she passed on through the doorway. She had not seen me, though doubtless she had heard me as I stepped aside. With a feeling of renewed confidence I now joined the throng in the corridor, threading my way in and out among the people to avoid contact with them and searching diligently all the while for the entrance to a ramp leading upward. This I presently discovered, and it was not long thereafter that I reached the upper level of the palace, where a short search brought me to the guard room at the foot of the ramp leading to the royal hangars.

Idling in the guard room, the warriors then off duty were engaged in various pursuits. Some were cleaning their harness and polishing their metal; two were playing at jetan, while others were rolling tiny numbered spheres at a group of numbered holes—a fascinating game of chance, called yano, which is, I presume, almost as old as Barsoomian civilization. The room was filled with the laughter and oaths of fighting men. How alike are warriors the world over! But for their harness and their metal they might have been a detachment of the palace guard at Helium.

Passing among them I ascended the ramp to the roof where the hangars stood. Two warriors on duty at the top of the ramp almost blocked my further progress. It would be a narrow squeeze to pass between them and I feared detection. As I paused I could not but overhear their conversation.

"I tell you that he was struck from behind," said one. "He never knew what killed him," and I knew that they were talking about the guardsman I had killed.

"But from whence came his assassin?" demanded the other.

"The padwar believes it may have been a fellow member of the guard. There will be an investigation and we shall all be questioned."

"It was not I," said the other. "He was my best friend."

"Nor was it I."

"He had a way with women. Perhaps—"

My attention was distracted and their conversation terminated by the footsteps of a warrior running rapidly up the ramp. My position was now most precarious. The ramp was narrow and the man coming from behind might easily bump into me. I must, therefore, pass the sentries immediately and make my way to the roof. There was just sufficient room between the warrior at my left and the sidewall of the ramp for me to pass through, if he did not step back, and with all the stealth that I could summon I edged myself slowly behind him and you may rest assured that I breathed a sigh of relief when I had passed him.