It was usually about three hours after the evening meal, which was served immediately after dark, that the establishment quieted down definitely for the night. While I should have preferred waiting longer before undertaking that which I had in mind, I could not safely do so, since there was much to be accomplished before dawn. So it was that with the first indications that the occupants of the building in which my work was to be performed had retired for the night, I left my quarters and went directly to the laboratory, where, fortunately for my plans, the bodies of Gor Hajus, the assassin of Toonol, and 378-J-493811-P both reposed. It was the work of a few minutes to carry them to adjoining tables, where I quickly strapped them securely against the possibility that one or both of them might not be willing to agree to the proposition I was about to make them, and thus force me to anaesthetize them again. At last the incisions were made, the tubes attached and the motors started. 378-J-493811-P, whom I shall hereafter call by his own name, Dar Tarus, was the first to open his eyes; but he had not regained full consciousness when Gor Hajus showed signs of life.

I waited until both appeared quite restored. Dar Tarus was eyeing me with growing recognition that brought a most venomous expression of hatred to his countenance. Gor Hajus was frankly puzzled. The last he remembered was the scene in the death chamber at the instant that his executioner had run a sword through his heart. It was I who broke the silence.

"In the first place" I said, "let me tell you where you are, if you do not already know."

"I know well enough where I am," growled Dar Tarus.

"Ah!" exclaimed Gor Hajus, whose eyes had been roaming about the chamber. "I can guess where I am. What Toonolian has not heard of Ras Thavas? So they sold my corpse to the old butcher did they? And what now? Did I just arrive?"

"You have been here six years," I told him, "and you may stay here for ever unless we three can reach an agreement within the next few minutes, and that goes for you too, Dar Tarus."

"Six years!" mused Gor Hajus. "Well, out with it, man. What do you want? If it is to slay Ras Thavas, no! He has saved me from utter destruction; but name me some other, preferably Vobis Kan, Jeddak of Toonol. Find me a blade and I will slay a hundred to regain life."

"I seek the life of none unless he stands in the way of the fulfilment of my desire in this matter that I have in hand. Listen! Ras Thavas had here a beautiful Duhorian girl. He sold her body to Xaxa, Jeddara of Phundahl, transplanting the girl's brain to the wrinkled and hideous body of the Jeddara. It is my intention to regain the body, restore it to its own brain and return the girl to Duhor."

Gor Hajus grinned. "You have a large contract on your hands," he said, "but I can see that you are a man after my own heart and I am with you. It will give freedom and fighting, and all that I ask is a chance for one thrust at Vobis Kan."

"I promise you life," I replied; "but with the understanding that you serve me faithfully and none other, undertaking no business of your own, until mine has been carried to a successful conclusion."

"That means that I shall have to serve you for life," he replied, "for the thing you have undertaken you can never accomplish; but that is better than lying here on a cold ersite slab waiting for old Ras Thavas to come along and carve out my gizzard. I am yours! Let me up, that I may feel a good pair of legs under me again."

"And you?" I asked, turning to Dar Tarus as I released the bonds that held Gor Hajus. For the first time I now noticed that the ugly expression that I had first noted upon the face of Dar Tarus had given place to one of eagerness.

"Strike off my bonds!" he cried. "I will follow you to the ends of Barsoom and the way leads thus far to the fulfilment of your design; but it will not. It will lead to Phundahl and to the chamber of the wicked Xaxa, where, by the generosity of my ancestors, I may be given the opportunity to avenge the hideous wrong the creature did me. You could not have chosen one better fitted for your mission than Dar Tarus, one time soldier of the Jeddara's Guard, whom she had slain that in my former body one of her rotten nobles might woo the girl I loved."

A moment later the two men stood at my side, and without more delay I led them towards the runway that descended to the path beneath the building. As we went, I described to them the creature I had chosen to be the fourth member of our strange party. Gor Hajus questioned the wisdom of my choice, saying that the ape would attract too much attention to us. Dar Tarus, however, believed that it might be helpful in many respects, since it was possible that we might be compelled to spend some time among the islands of the marshes which were often infested with these creatures; while, once in Phundahl, the ape might readily be used in the furtherance of our plans and would cause no considerable comment in a city where many of these beasts are held in captivity and often are seen performing for the edification of street crowds.

We went at once to the vault where the ape lay and where I had concealed the anaesthetized body of Valla Dia. Here I revived the great anthropoid and to my great relief found that the human half of its brain still was dominant. Briefly I explained my plan as I had to the other two and won the hearty promise of his support upon my engaging to restore his brain to its rightful place upon the completion of our venture.

First we must get off the island, and I outlined two plans I had in mind. One was to steal one of Ras Thavas' three fliers and set out directly for Phundahl, and the other, in the event that the first did not seem feasible, was to secrete ourselves aboard one of them on the chance that we might either overpower the crew and take over the ship after we had left the island, or escape undetected upon its arrival in Toonol. Dar Tarus liked the first plan; the ape, whom we now called by the name belonging to the human half of his brain, Hovan Du, preferred the first alternative of the second plan; and Gor Hajus the second alternative.

Dar Tarus explained that as our principal objective was Phundahl, the quicker we got there the better. Hovan Du argued that by seizing the ship after it had left the island we would have longer time in which to make our escape before the ship was missed and pursuit instituted, than by seizing it now in the full knowledge that its absence would be discovered within a few hours. Gor Hajus thought that it would be better if we could come into Toonol secretly and there, through one of his friends, secure arms and a flier of our own. It would never do, he insisted, to attempt to go far without arms for himself and Dar Tarus, nor could we hope to reach Phundahl without being overhauled by pursuers; for we must plan on the hypothesis that Ras Thavas would immediately discover my absence; that he would at once investigate; that he would find Dar Tarus and Gor Hajus missing and thereupon lose no time in advising Vobis Kan, Jeddak of Toonol, that Gor Hajus the assassin was at large, whereupon the Jeddak's best ships would be sent in pursuit.

Gor Hajus' reasoning was sound and coupled with my recollection that Ras Thavas had told me that his three ships were slow, I could readily foresee that our liberty would be of short duration were we to steal one of the old surgeon's fliers.

As we discussed the matter we had made our way through the pits and I had found the exit to the tower. Silently we passed upward along the runway and out upon the roof. Both moons were winging low through the heavens and the scene was almost as light as day. If anyone was about, discovery was certain. We hastened towards the hangar and were soon within it where, for a moment at least, I breathed far more easily than I had beneath those two brilliant moons upon the exposed roof.

The fliers were peculiar-looking contrivances, low, squat, with rounded bows and stems and covered decks, their every line proclaiming them as cargo carriers built for anything but speed. One was much smaller than the other two and a second was evidently undergoing repairs. The third I entered and examined carefully. Gor Hajus was with me and pointed out several places where we might hide with little likelihood of discovery unless it were suspected that we might be aboard, and that of course constituted a very real danger; so much so that I had about decided to risk all aboard the small flier, which Gor Hajus assured me would be the fastest of the three, when Dar Tarus stuck his head into the ship and motioned me to come quickly.

"There is someone about," he said when I reached his side.

"Where?" I demanded.

"Come," he said, and led me to the rear of the hangar, which was flush with the wall of the building upon which it stood, and pointed through one of the windows into the inner garden where, to my consternation, I saw Ras Thavas walking slowly to and fro. For an instant I was sick with despair, for I knew that no ship could leave that roof unseen while anyone was abroad in the garden beneath, and Ras Thavas least of all people in the world; but suddenly a great light dawned upon me. I called the three close to me and explained my plan.

Instantly they grasped the possibilities in it and a moment later we had run the small flier out upon the roof and turned her nose toward the east, away from Toonol. Then Gor Hajus entered her, set the various controls as we had decided, opened the throttle, slipped back to the roof. The four of us hastened into the hangar and ran to the rear window where we saw the ship moving slowly and gracefully out over the garden and the head of Ras Thavas, whose ears must instantly have caught the faint purring of the motor, for he was looking up by the time we reached the window.

Instantly he hailed the ship and stepping back from the window that he might not see me I answered: "Good-bye, Ras Thavas! It is I, Vad Varo, going out into a strange world to see what it is like. I shall return. The spirits of your ancestors be with you until then."

That was a phrase I had picked up from reading in Ras Thavas' library and I was quite proud of it.

"Come back at once," he shouted up in reply, "or you will be with the spirits of your own ancestors before another day is done."

I made no reply. The ship was now at such a distance that I feared my voice might no longer seem to come from it and that we should be discovered. Without more delay we concealed ourselves aboard one of the remaining fliers, that upon which no work was being done, and there commenced as long and tiresome a period of waiting as I can recall ever having passed through.

I had at last given up any hope of the ship's being flown that day when I heard voices in the hangar, and presently the sound of footsteps aboard the flier. A moment later a few commands were given and almost immediately the ship moved slowly out into the open.

The four of us were crowded into a small compartment built into a tiny space between the forward and aft starboard buoyancy tanks. It was very dark and poorly ventilated, having evidently been designed as a storage closet to utilize otherwise waste space. We dared not converse for fear of attracting attention to our presence, and for the same reason we moved about as little as possible, since we had no means of knowing but that some member of the crew might be just beyond the thin door that separated us from the main cabin of the ship.

Altogether we were most uncomfortable; but the distance to Toonol is not so great but that we might hope that our situation would soon be changed--at least if Toonol was to be the destination of the ship. Of this we soon had cheering hope. We had been out but a short time when, faintly, we heard a hail and then the motors were immediately shut down and the ship stopped.

"What ship?" we heard a voice demand, and from aboard our own came the reply: "The Vosar, Tower of Thavas for Toonol." We heard a scraping as the other ship touched ours.

"We are coming aboard to search you in the name of Vobis Kan, Jeddak of Toonol. Make way!" shouted one from the other ship. Our cheer had been of short duration. We heard the shuffling of many feet and Gor Hajus whispered in my ear.

"What shall we do?" he asked.

I slipped my short-sword into his hand. "Fight!" I replied.

"Good, Vad Varo," he replied, and then I handed him my pistol and told him to pass it on to Dar Tarus. We heard the voices again, but nearer now.

"What ho!" cried one. "It is Bal Zak himself, my old friend Bal Zak!" "None other," replied a deep voice. "And whom did you expect to find in command of the Vosar other than Bal Zak?"

"Who could know but that it might have been this Vad Varo himself, or even Gor Hajus," said the other, "and our orders are to search all ships."

"I would that they were here," replied Bal Zak, "for the reward is high. But how could they, when Ras Thavas himself with his own eyes saw them fly off in the Pinsar before dawn this day and disappear in the east?"

"Right you are, Bal Zak," agreed the other, "and it were a waste of time to search your ship. Come men! to our own!" I could feel the muscles about my heart relax with the receding footfalls of Vobis Kan's warriors as they quitted the deck of the Vosar for their own ship, and my spirits rose with the renewed purring of our own motor as Ras Thavas' flier again got under way. Gor Hajus bent his lips close to my ear.

"The spirits of our ancestors smile upon us," he whispered. "It is night and the darkness will aid in covering our escape from the ship and the landing stage."

"What makes you think it is night?" I asked.

"Vobis Kan's ship was close by when it hailed and asked our name. By daylight it could have seen what ship we were."

He was right. We had been locked in that stuffy hole since before dawn, and while I had thought that it had been for a considerable time, I also had realized that the darkness and the inaction and the nervous strain would tend to make it seem much longer than it really had been; so that I would not have been greatly surprised had we made Toonol by daylight.

The distance from the Tower of Thavas to Toonol is inconsiderable, so that shortly after Vobis Kan's ship had spoken to us we came to rest upon the landing stage at our destination. For a long time we waited, listening to the sounds of movement aboard the ship and wondering, upon my part at least, as to what the intentions of the captain might be. It was quite possible that Bal Zak might return to Thavas this same night, especially if he had come to Toonol to fetch a rich or powerful patient to the laboratories; but if he had come only for supplies he might well lie here until the morrow. This much I had learned from Gor Hajus, my own knowledge of the movements of the fliers of Ras Thavas being considerably less than nothing; for, though I had been months a lieutenant of the master surgeon, I had learned only the day before of the existence of his small fleet, it being according to the policy of Ras Thavas to tell me nothing unless the telling of it coincided with and furthered his own plans.

Questions which I asked he always answered, if he reasoned that the effects would not be harmful to his own interests, but he volunteered nothing that he did not particularly wish me to know; and the fact that there were no windows in the outside walls of the building facing towards Toonol, that I had never before the previous day been upon the roof and that I never had seen a ship sail over the inner court towards the east all tended to explain my ignorance of the fleet and its customary operations.

We waited quietly until silence fell upon the ship, betokening either that the crew had retired for the night or that they had gone down into the city. Then, after a whispered consultation with Gor Hajus, we decided to make an attempt to leave the flier. It was our purpose to seek a hiding place within the tower of the landing stage from which we might investigate possible avenues of escape into the city, either at once or upon the morrow when we might more easily mix with the crowd that Gor Hajus said would certainly be in evidence from a few hours after sunrise.

Cautiously I opened the door of our closet and looked into the main cabin beyond. It lay in darkness. Silently we filed out. The silence of the tomb lay upon the flier, but from far below arose the subdued noises of the city. So far, so good! Then, without sound, without warning, a burst of brilliant fight illuminated the interior of the cabin. I felt my fingers tighten upon my sword-hilt as I glanced quickly about.

Directly opposite us, in the narrow doorway of a small cabin, stood a tall man whose handsome harness betokened the fact that he was no common warrior. In either hand he held a heavy Barsoomian pistol, into the muzzles of which we found ourselves staring.