It was my intention to fly low and make my demands for the return of Dejah Thoris and Gar Nal to me, without putting myself in the power of the Ombrans.

If they refused, which I was quite certain that they would, I intended giving them a demonstration of the effectiveness of the firearms of Barsoom through the medium of the ship's guns that I have already described. That, I was confident, would bring the Jeddak to terms; and I hoped to accomplish it without unnecessary loss of life.

We were all quite gay as we sailed off toward Ombra. Jat Or and Zanda were planning upon the home they expected to establish in Helium, and Ur Jan was anticipating a position among the fighting men of my retinue and a life of honor and respectability.

Presently, Zanda called my attention to the fact that we were gaining considerable altitude, and complained of dizziness. Almost at the same time I felt a weakness stealing over me, and simultaneously Ur Jan collapsed.

Followed by Jat Or, I staggered to the control room, where a glance at the altimeter showed me that we had risen to dangerous heights. Instantly I directed the brain to regulate the oxygen supply in the interior of the ship, and then I directed it to drop nearer to the surface of the satellite.

It obeyed my directions insofar as the oxygen supply was concerned, but it continued to rise past the point where the altimeter could register our height.

As Thuria faded in the distance astern, I realized that we were flying at tremendous speed, a speed far in excess of that which I had directed.

It was evident that the brain was entirely out of control. There was nothing more that I could do; so I returned to the cabin. Here I found that both Zanda and Ur Jan had recovered, now that the oxygen supply had been replenished.

I told them that the ship was running wild in space and that our eventual fate could be nothing more than a matter of idle speculation- they knew as much about it as I.

My hopes, that had been so high, were now completely dashed; and the farther that we sped from Thuria, the greater became my anguish, though I hid my personal feelings from my companions.

It was not until it became apparent that we were headed for Barsoom that even hope of life was renewed in the breasts of any of us.

As we drew near the surface of the planet, it became evident to me that the ship was fully under control; and I wondered whether or not the brain itself had discovered the power of original thought, for I knew that I was not controlling it nor were any of my companions.

It was night, a very dark night. The ship was approaching a large city. I could see the lights ahead, and as we drew closer I recognized that the city was Zodanga.

As though guided by a human hand and brain, the ship slid silently across the eastern wall of the great city, dropped into the shadows of a dark avenue, and moved steadily toward its unknown destination.

But not for long was the destination to be unknown. Presently the neighborhood became familiar. We were moving very slowly. Zanda was with me in the control room, gazing through one of the forward ports.

"The house of Fal Sivas!" she exclaimed.

I recognized it, too, and then just in front of us I saw the open doors of the great hangar from which I had stolen the ship.

With the utmost precision, the ship turned slowly about until its tail pointed toward the hangar doorway. Then it backed in and settled down upon its scaffolding.

At my direction, the doors opened and the ladder dropped out to the floor; and a moment later I was searching for Fal Sivas, to demand an explanation. Ur Jan and Jat Or accompanied me with drawn swords, and Zanda followed close behind.

I went at once to Fal Sivas's sleeping quarters. They were deserted; but as I was leaving them, I saw a note fastened beside the door. It was addressed to me.

I opened it and read the following:

From Fal Sivas

Of Zodanga

To John Carter

Of Helium

Let this be known:

You betrayed me. You stole my ship. You thought that your puny mind could best that of the great Fal Sivas.

Very well, John Carter, it shall be a duel of minds-my mind against yours.

Let us see who will win.

I am recalling the ship.

I am directing it to return from wherever it may be and at full speed. It is to allow no other brain to change its course. I am commanding it to return to its hangar and remain there forever unless it receives contrary directions from my brain.

Know you then, John Carter, when you read this note, that I, Fal Sivas, have won; and that as long as I live, no other brain than mine can ever cause my ship to move.

I might have dashed the ship to pieces against the ground and thus destroyed you; but then I could not have gloated over you, as I now shall.

Do not search for me. I am hidden where you can never find me.

I have written. That is all.

There was a grim finality about that note and a certain authority that seemed to preclude even faint hope. I was crushed.

In silence, I handed it to Jat Or and asked him to read it aloud to the others.

When he had finished it, Ur Jan drew his short sword and offered it to me hilt first.

"It is I who am the cause of your sorrow," he said. "My life belongs to you. I offer it to you now in atonement."

I shook my head and pushed his hand away. "You did not know what you were doing, Ur Jan," I said.

"Perhaps it is not the end," said Zanda. "Where can Fal Sivas hide that determined men may not find him?"

"Let us dedicate our lives to that purpose," said Jat Or; and there, in the quarters of Fal Sivas, we four swore to hunt him down.

As we stepped out into the corridor, I saw a man approaching. He was tiptoeing stealthily in our direction. He did not see me instantly because he was casting an apprehensive glance back across his shoulder, as though fearful of discovery from that direction.

When he faced me, we were both surprised-it was Rapas the Ulsio.

At sight of Ur Jan and me standing side by side, The Rat went ashen grey. He started to turn, as though to run; but evidently he thought better of it, for he immediately faced us again, and stood staring at us as though fascinated.

As we approached him, he affected a silly grin. "Well, Vandor," he said, "this is a surprise. I am glad to see you."

"Yes, you must be," I replied. "What are you doing here?"

"I came to see Fal Sivas."

"Did you expect to find him here?" demanded Ur Jan.

"Yes," replied Rapas.

"Then why were you sneaking in on your tiptoes?" inquired the assassin. "You are lying, Rapas. You knew that Fal Sivas was not here. If you had thought that he was here, you would not have had the nerve to come, for you knew that he knew that you were in my employ."

Ur Jan stepped forward quickly and grasped Rapas by the throat. "Listen, you rat," he growled; "you know where Fal Sivas is. Tell me, or I'll wring your neck."

The fellow commenced to grovel and whine, "Don't, don't; you are hurting me," he cried. "You will kill me."

"At least you have told the truth for once," growled the assassin. "Quick now; out with it. Where is Fal Sivas?"

"If I tell you, will you promise not to kill me?" asked The Rat.

"We will promise you that and more," I said; "Tel us where Fal Sivas is, and I'll give you your weight in treasure."

"Speak up," said Ur Jan, giving the fellow a shake.

"Fal Sivas is in the house of Gar Nal," whispered Rapas, "but don't tell him that I told you; don't tell him that I told you or he will kill me horribly."

I did not dare turn Rapas loose for fear he would betray us, and furthermore he promised to gain entrance to Gar Nal's for us and lead us to the room where we would find Fal Sivas.

I could not imagine what Fal Sivas was doing in the house of Gar Nal, unless he had gone there in Gar Nal's absence in an attempt to steal some of his secrets; nor did I bother to question Rapas about it, as it did not seem of any great importance to me. It was enough that Fal Sivas was there, and that I should find him.