In so far as I could know I reached my apartment without detection. Hiding my rope where I was sure it would not be discovered, I sought my sleeping silks and furs and was soon asleep.

The following morning as I emerged from my quarters I caught a fleeting glimpse of a figure in a nearby corridor and from then on for a long time I had further evidence that Ras Thavas suspicioned me. I went at once to his quarters, as had been my habit. He seemed restless, but he gave me no hint that he held any assurance that I had been responsible for the disappearance of Valla Dia, and I think that he was far from positive of it. It was simply that his judgment pointed to the fact that I was the only person who might have any reason for interfering in any way with this particular subject, and he was having me watched to either prove or disprove the truth of his reasonable suspicions. His restlessness he explained to me himself.

"I have often studied the reaction of others who have undergone brain transference," he said, "and so I am not wholly surprised at my own. Not only has my brain energy been stimulated, resulting in an increased production of nervous energy, but I also feel the effects of the young tissue and youthful blood of my new body. They are affecting my consciousness in a way that my experiment had vaguely indicated, but which I now see must be actually experienced to be fully understood. My thoughts, my inclinations, even my ambitions have been changed, or at least coloured, by the transfer. It will take some time for me to find myself."

Though uninterested, I listened politely until he was through and then I changed the subject "Have you located the missing woman?" I asked.

He shook his head, negatively.

"You must appreciate, Ras Thavas," I said, "that I fully realize that you must have known that the removal or destruction of that woman would entirely frustrate my entire plan. You are master here. Nothing that passes is without your knowledge."

"You mean that I am responsible for the disappearance of the woman?" he demanded.

"Certainly. It is obvious. I demand that she be restored."

He lost his temper. "Who are you to demand?" he shouted. "You are naught but a slave. Cease your impudence or I shall erase you-erase you. It will be as though you never had existed."

I laughed in his face. "Anger is the most futile attribute of the sentimentalist," I reminded him. "You will not erase me, for I alone stand between you and mortality."

"I can train another," he parried.

"But you could not trust him," I pointed out.

"But you bargained with me for my life when you had me in your power," he cried.

"For nothing that it would have harmed you to have granted willingly. I did not ask anything for myself. Be that as it may, you will trust me again. You will trust, for no other reason than that you will be forced to trust me. So why not win my gratitude and my loyalty by returning the woman to me and carrying out in spirit as well as in fact the terms of our agreement?"

He turned and looked steadily at me. "Vad Varo," he said, "I give you the word of honor of a Barsoomian noble that I know absolutely nothing concerning the whereabouts of 4296-E-2631-H."

"Perhaps Yamdor does," I persisted.

"Nor Yamdor. Of my knowledge no person in any way connected with me knows what became of it. I have spoken the truth."

Well, the conversation was not as profitless as it might appear, for I was sure that it had almost convinced Ras Thavas that I was equally as ignorant of the fate of Valla Dia as was he. That it had not wholly convinced him was evidenced by the fact that the espionage continued for a long time, a fact which determined me to use Ras Thavas' own methods in my own defence. I had had allotted to me a number of slaves, and these I had won over by kindness and understanding until I knew that I had the full measure of their loyalty. They had no reason to love Ras Thavas and every reason to hate him; on the other hand they had no reason to hate me, and I saw to it that they had every reason to love me.

The result was that I had no difficulty in enlisting the services of a couple of them to spy upon Ras Thavas' spies, with the result that I was soon apprised that my suspicions were well founded-I was being constantly watched every minute that I was out of my apartments, but the spying did not come beyond my outer chamber walls. That was why I had been successful in reaching the vault in the manner that I had, the spies having assumed that I would leave my chamber only by its natural exit, had been content to guard that and permit my windows to go unwatched.

I think it was about two of our months that the spying continued and then my men reported that it seemed to have ceased entirely. All that time I was fretting at the delay, for I wanted to be about my plans which would have been absolutely impossible for me to carry out if I were being watched. I had spent the interval in studying the geography of the north-eastern Barsoomian hemisphere where my activities were to be carried on, and also in scanning a great number of case histories and inspecting the subjects to which they referred; but at last, with the removal of the spies, it began to look as though I might soon commence to put my plans in active operation.

Ras Thavas had for some time permitted me considerable freedom in independent investigation and experiment, and this I determined to take advantage of in every possible way that might forward my plans for the resurrection of Valla Dia. My study of the histories of many of the cases had been with the possibility in mind of discovering subjects that might be of assistance to me in my venture. Among those that had occupied my careful attention were, quite naturally, the cases with which I had been most familiar, namely: 378-J-493811-P, the red-man from whose vicious attack I had saved Ras Thavas upon the day of my advent upon Mars; and he whose brain had been divided with an ape.

The former, 378-J-493811-P, had been a native of Phundahl-a young warrior attached to the court of Xaxa, Jeddara of Phundahl-and a victim of assassination. His body had been purchased by a Phundahlian noble for the purpose, as Ras Thavas had narrated, of winning the favor of a young beauty. I felt that I might possibly enlist his services, but that would depend upon the extent of his loyalty towards Xaxa, which I could only determine by reviving and questioning him.

He whose brain had been divided with an ape had originated in Ptarth, which lay at a considerable distance to the west of Phundahl and a little south and about an equal distance from Duhor, which lay north and a little west of it. An inhabitant of Ptarth, I reasoned, would know much of the entire country included in the triangle formed by Phundahl, Ptarth and Duhor; the strength and ferocity of the great ape would prove of value in crossing beast-infested wastes; and I felt that I could hold forth sufficient promise to the human half of the great beast's brain, which really now dominated the creature, to win its support and loyalty. The third subject that I had tentatively selected had been a notorious Toonolian assassin, whose audacity, fearlessness and swordsmanship had won for him a reputation that had spread far beyond the boundaries of his country.

Ras Thavas, himself a Toonolian, had given me something of the history of this man whose grim calling is not without honor upon Barsoom, and which Gor Hajus had raised still higher in the esteem of his countrymen through the fact that he never struck down a woman or a good man and that he never struck from behind.

His killings were always the results of fair fights in which the victim had every opportunity to defend himself and slay his attacker; and he was famous for his loyalty to his friends. In fact this very loyalty had been a contributing factor in his downfall which had brought him to one of Ras Thavas' ersite slabs some years since, for he had earned the enmity of Vobis Kan, Jeddak of Toonol, through his refusal to assassinate a man who once had befriended Gor Hajus in some slight degree; following which Vobis Kan conceived the suspicion that Gor Hajus had him marked for slaying. The result was inevitable: Gor Hajus was arrested and condemned to death; immediately following the execution of the sentence, an agent of Ras Thavas had purchased the body.