"The jeddak requests your immediate presence in the Hall of Jeddaks in the imperial palace in Greater Helium."

"At once," I replied.

"May I fly you over, sir?" he asked. "I came in a two-seater."

"Thanks," I replied. "I'll join you at the hangar in a moment." He saluted and left us.

"Who was he?" asked Dejah Thoris. "I don't recall ever having seen him before."

"Probably one of the new officers from Zor, whom Tardos Mors has commissioned in the Jeddak's Guard. It was a gesture of his, made to assure Zor that he has the utmost confidence in the loyalty of that city and as a measure for healing old wounds."

Zor, which lies about three hundred eighty miles southeast of Helium, is one of the most recent conquests of Helium and had given us a great deal of trouble in the past because of treasonable acts instigated by a branch of its royal family led by one Multis Par, a prince. About five years before the events I am about to narrate occurred, this Multis Par had disappeared; and since then Zor had given us no trouble. No one knew what had become of the man, and it was supposed that he had either taken the last, long voyage down the river Iss to the Lost Sea of Korus in the Valley Dor or had been captured and murdered by members of some horde of savage Green men. Nor did anyone appear to care-just so he never returned to Zor, where he was thoroughly hated for his arrogance and cruelty.

"I hope that my revered grandfather does not keep you long," said Dejah Thoris. "We are having a few guests for dinner tonight, and I do not wish you to be late."

"A few!" I said. "How many? Two hundred or three hundred?"

"Don't be impossible," she said, laughing, "Really, only a few."

"A thousand, if it pleases you, my dear," I assured her as I kissed her. "And now, good-by! I'll doubtless be back within the hour." That was a year ago!

As I ran up the ramp toward the hangar on the palace roof, I had, for some then unaccountable reason, a sense of impending ill; but I attributed it to the fact that my tкte-а-tкte with my princess had been so quickly interrupted.

The thin air of dying Mars renders the transition from day to night startlingly sudden to an earthman. Twilight is of short duration owing to the negligible refraction of the sun's rays. When I had left Dejah Thoris, the sun, though low, was still shining; the garden was in shadow, but it was still daylight. When I stepped from the head of the ramp to that part of the roof of the palace where the hangar was located which housed the private fliers of the family, dim twilight partially obscured my vision. It would soon be dark. I wondered why the hangar guard had not switched on the lights.

In the very instant that I realized that something was amiss, a score of men surrounded and overpowered me before I could draw and defend myself. A voice cautioned me to silence. It was the voice of the man who had summoned me into this trap, When the others spoke, it was in a language I had never heard before. They spoke in dismal, hollow monotone, expressionless, sepulchral.

They had thrown me face down upon the pavement and trussed my wrists behind my back. Then they jerked me roughly to my feet. Now, for the first time, I obtained a fairly good sight of my captors. I was appalled. I could not believe my own eyes. These things were not men. They were human skeletons! Black eye sockets looked out from grinning skulls. Bony, skeletal fingers grasped my arms. It seemed to me that I could see every bone in each body. Yet the things were alive! They moved. They spoke. They dragged me toward a strange craft that I had not before noticed.