High Priestess of a horrid cult, though she was, and queen of a race of half-beasts, yet she was a woman, too, a woman who had loved but once and given that love to the godlike ape-man who was again within her power. Twice before had he escaped her sacrificial knife; in the final instance love had at last triumphed over jealousy and fanaticism, and La, the woman, had realized that never again could she place in jeopardy the life of the man she loved, however hopeless she knew that love to be.

Tonight she was faced with a problem that she felt almost beyond her powers of solution. The fact that she was mated with Cadj removed the last vestige of hope that she had ever had of becoming the wife of the ape-man. Yet she was no less determined to save Tarzan if it were possible. Twice had he saved her life, once from a mad priest, and once from Tantor in must. Then, too, she had given her word that when Tarzan came again to Opar he came in friendship and would be received in friendship. But the influence of Cadj was great, and she knew that that influence had been directed unremittingly against the ape-man--she had seen it in the attitude of her followers from the very moment that they had placed Tarzan upon a litter to bear him back to Opar--she had seen it in the evil glances that had been cast at her. Sooner or later they would dare denounce her--all that they needed was some slight, new excuse, that, she knew, they eagerly awaited in her forthcoming attitude toward Tarzan. It was well after midnight when there came to her one of the priestesses who remained always upon guard outside her chamber door.

"Dooth would speak with you," whispered the hand-maiden.

"It is late," replied La, "and men are not permitted in this part of the temple. How came he here, and why?"

"He says that he comes in the service of La, who is in great danger," replied the girl.

"Fetch him here then," said La, "and as you value your life see that you tell no one."

"I shall be as voiceless as the stones of the altar," replied the girl, as she turned and left the chamber.

A moment later she returned, bringing Dooth, who halted a few feet from the High Priestess and saluted her. La signaled to the girl who had brought him, to depart, and then she turned questioningly to the man.

"Speak, Dooth!" she commanded.

"We all know," he said, "of La's love for the strange ape-man, and it is not for me, a lesser priest, to question the thoughts or acts of my High Priestess. It is only for me to serve, as those would do better to serve who now plot against you."

"What do you mean, Dooth? Who plots against me?"

"Even at this minute are Cadj and Oah and several of the priests and priestesses carrying out a plan for your undoing. They are setting spies to watch you, knowing that you would liberate the ape-man, because there will come to you one who will tell you that to permit him to escape will be the easiest solution of your problem. This one will be sent by Cadj, and then those who watch you will report to the people and to the priests that they have seen you lead the sacrifice to liberty. But even that will avail you nothing, for Cadj and Oah and the others have placed upon the trail from Opar many men in hiding, who will fall upon the ape-man and slay him before the Flaming God has descended twice into the western forest. In but one way only may you save yourself, La of Opar."

"And what is that way?" she asked.

"You must, with your own hands, upon the altar of our temple, sacrifice the ape-man to the Flaming God."

Chapter VIII. MYSTERY OF THE PAST

La had breakfasted the following morning, and had sent Dooth with food for Tarzan, when there came to her a young priestess, who was the sister of Oah. Even before the girl had spoken La knew that she was an emissary from Cadj, and that the treachery of which Dooth had warned her was already under way. The girl was ill at ease and quite evidently frightened, for she was young and held in high revere the queen whom she had good reason to know was all-powerful, and who might even inflict death upon her if she so wished. La, who had already determined upon a plan of action that she knew would be most embarrassing to Cadj and his conspirators, waited in silence for the girl to speak. But it was some time before the girl could muster up her courage or find a proper opening. Instead, she spoke of many things that had no bearing whatsoever upon her subject, and La, the High Priestess, was amused at her discomfiture.

"It is not often," said La, "that the sister of Oah comes to the apartments of her queen unless she is bidden. I am glad to see that she at last realizes the service that she owes to the High Priestess of the Flaming God."

"I come," said the girl, at last, speaking almost as one who has learned a part, "to tell you that I have overheard that which may be of interest to you, and which I am sure that you will be glad to hear."

"Yes?" interrogated La, raising her arched eyebrows.

"I overheard Cadj speaking with the lesser priests," the girl continued, "and I distinctly heard him say that he would be glad if the ape-man escaped, as that would relieve you, and Cadj as well, of much embarrassment. I thought that La, the queen, would be glad to know this, for it is known by all of us that La has promised friendship to the ape-man, and therefore does not wish to sacrifice him upon the altar of the Flaming God."

"My duty is plain to me," replied La, in a haughty voice, "and I do not need Cadj nor any hand-maiden to interpret it to me. I also know the prerogatives of a High Priestess, and that the right of sacrifice is one of them. For this reason I prevented Cadj from sacrificing the stranger. No other hand than mine may offer his heart’s blood to the Flaming God, and upon the third day he shall die beneath my knife upon the altar of our temple."

The effect of these words upon the girl were precisely what La had anticipated. She saw disappointment and chagrin written upon the face of Cadj's messenger, who now had no answer, for her instructions had not foreseen this attitude upon the part of La. Presently the girl found some lame pretext upon which to withdraw, and when she had left the presence of the High Priestess, La could scarcely restrain a smile. She had no intention of sacrificing Tarzan, but this, of course, the sister of Oah did not know.