Here they made her fast, and then both again descended to the ground to complete the preparations for departure. Phaidor entered the small cabin upon the vessel's deck.

I had come to within a quarter of a mile of them when Matai Shang espied me. I saw him seize Thurid by the shoulder, wheeling him around in my direction as he pointed to where I was now plainly visible, for the moment that I knew I had been perceived I cast aside every attempt at stealth and broke into a mad race for the flier.

The two redoubled their efforts at the propeller at which they were working, and which very evidently was being replaced after having been removed for some purpose of repair.

They had the thing completed before I had covered half the distance that lay between me and them, and then both made a rush for the boarding-ladder.

Thurid was the first to reach it, and with the agility of a monkey clambered swiftly to the boat's deck, where a touch of the button controlling the buoyancy tanks sent the craft slowly upward, though not with the speed that marks the well-conditioned flier.

I was still some hundred yards away as I saw them rising from my grasp.

Back by the city of Kadabra lay a great fleet of mighty fliers-the ships of Helium and Ptarth that I had saved from destruction earlier in the day; but before ever I could reach them Thurid could easily make good his escape.

As I ran I saw Matai Shang clambering up the swaying, swinging ladder toward the deck, while above him leaned the evil face of the First Born. A trailing rope from the vessel's stern put new hope in me, for if I could but reach it before it whipped too high above my head there was yet a chance to gain the deck by its slender aid.

That there was something radically wrong with the flier was evident from its lack of buoyancy, and the further fact that though Thurid had turned twice to the starting lever the boat still hung motionless in the air, except for a slight drifting with a low breeze from the north.

Now Matai Shang was close to the gunwale. A long, claw-like hand was reaching up to grasp the metal rail.

Thurid leaned farther down toward his co-conspirator.

Suddenly a raised dagger gleamed in the upflung hand of the black. Down it drove toward the white face of the Father of Therns. With a loud shriek of fear the Holy Hekkador grasped frantically at that menacing arm.

I was almost to the trailing rope by now. The craft was still rising slowly, the while it drifted from me. Then I stumbled on the icy way, striking my head upon a rock as I fell sprawling but an arm's length from the rope, the end of which was now just leaving the ground.

With the blow upon my head came unconsciousness.

It could not have been more than a few seconds that I lay senseless there upon the northern ice, while all that was dearest to me drifted farther from my reach in the clutches of that black fiend, for when I opened my eyes Thurid and Matai Shang yet battled at the ladder's top, and the flier drifted but a hundred yards farther to the south-but the end of the trailing rope was now a good thirty feet above the ground.

Goaded to madness by the cruel misfortune that had tripped me when success was almost within my grasp, I tore frantically across the intervening space, and just beneath the rope's dangling end I put my earthly muscles to the supreme test.

With a mighty, catlike bound I sprang upward toward that slender strand-the only avenue which yet remained that could carry me to my vanishing love.

A foot above its lowest end my fingers closed. Tightly as I clung I felt the rope slipping, slipping through my grasp. I tried to raise my free hand to take a second hold above my first, but the change of position that resulted caused me to slip more rapidly toward the end of the rope.

Slowly I felt the tantalizing thing escaping me. In a moment all that I had gained would be lost-then my fingers reached a knot at the very end of the rope and slipped no more.

With a prayer of gratitude upon my lips I scrambled upward toward the boat's deck. I could not see Thurid and Matai Shang now, but I heard the sounds of conflict and thus knew that they still fought-the thern for his life and the black for the increased buoyancy that relief from the weight of even a single body would give the craft.

Should Matai Shang die before I reached the deck my chances of ever reaching it would be slender indeed, for the black dator need but cut the rope above me to be freed from me forever, for the vessel had drifted across the brink of a chasm into whose yawning depths my body would drop to be crushed to a shapeless pulp should Thurid reach the rope now.

At last my hand closed upon the ship's rail and that very instant a horrid shriek rang out below me that sent my blood cold and turned my horrified eyes downward to a shrieking, hurtling, twisting thing that shot downward into the awful chasm beneath me.

It was Matai Shang, Holy Hekkador, Father of Therns, gone to his last accounting.

Then my head came above the deck and I saw Thurid, dagger in hand, leaping toward me. He was opposite the forward end of the cabin, while I was attempting to clamber aboard near the vessel's stern. But a few paces lay between us. No power on earth could raise me to that deck before the infuriated black would be upon me.

My end had come. I knew it; but had there been a doubt in my mind the nasty leer of triumph upon that wicked face would have convinced me. Beyond Thurid I could see my Dejah Thoris, wide-eyed and horrified, struggling at her bonds. That she should be forced to witness my awful death made my bitter fate seem doubly cruel.

I ceased my efforts to climb across the gunwale. Instead I took a firm grasp upon the rail with my left hand and drew my dagger.

I should at least die as I had lived-fighting.

As Thurid came opposite the cabin's doorway a new element projected itself into the grim tragedy of the air that was being enacted upon the deck of Matai Shang's disabled flier.

It was Phaidor.

With flushed face and disheveled hair, and eyes that betrayed the recent presence of mortal tears-above which this proud goddess had always held herself-she leaped to the deck directly before me.

In her hand was a long, slim dagger. I cast a last look upon my beloved princess, smiling, as men should who are about to die. Then I turned my face up toward Phaidor-waiting for the blow.

Never have I seen that beautiful face more beautiful than it was at that moment. It seemed incredible that one so lovely could yet harbor within her fair bosom a heart so cruel and relentless, and today there was a new expression in her wondrous eyes that I never before had seen there-an unfamiliar softness, and a look of suffering.

Thurid was beside her now-pushing past to reach me first, and then what happened happened so quickly that it was all over before I could realize the truth of it.

Phaidor's slim hand shot out to close upon the black's dagger wrist. Her right hand went high with its gleaming blade.

"That for Matai Shang!" she cried, and she buried her blade deep in the dator's breast. "That for the wrong you would have done Dejah Thoris!" and again the sharp steel sank into the bloody flesh.

"And that, and that, and that!" she shrieked, "for John Carter, Prince of Helium," and with each word her sharp point pierced the vile heart of the great villain. Then, with a vindictive shove she cast the carcass of the First Born from the deck to fall in awful silence after the body of his victim.

I had been so paralyzed by surprise that I had made no move to reach the deck during the awe-inspiring scene which I had just witnessed, and now I was to be still further amazed by her next act, for Phaidor extended her hand to me and assisted me to the deck, where I stood gazing at her in unconcealed and stupefied wonderment.