"I am Thetan of Thobos," he said. "I owe you my life, but why did you come to my aid? Are we to be friends or foes?"
"I am Tarzan," said the ape-man. "Let us be friends."
"Let us be friends," agreed Thetan. "Now tell me how I may repay you for what you have done for me."
"I wish to go to Ashair," said Tarzan.
The warrior shook his head. "You have asked me one thing that I cannot do for you," he said. "The Asharians are our enemies. If I took you there, we'd both be imprisoned and destroyed; but perhaps I can persuade my king to let you come to Thobos; then, when the day comes that we conquer Ashair, you may enter the city with us. But why do you wish to go to Ashair?"
"I am not alone," said Tarzan, "and in my party are the father and sister of a man we believe to be a prisoner in Ashair. It is to obtain his release that we are here."
"Perhaps my King will let you all come to Thobos," said Thetan, rather dubiously. "Such a thing would be without precedent; but because you have saved the life of his nephew and because you are enemies of Ashair, he may grant permission. At least it will do no harm to ask him."
"How may I know his answer?" asked Tarzan.
"I can bring it to you, but it will be some time before I can do so," replied Thetan. "I am down here on a mission for the King. I came by way of the only land trail out of Tuen-Baka, a trail known only to my people. I shall sleep tonight in a cave I know of, and tomorrow start back for Thobos. In three days I shall return if Herat will permit you to enter Thobos. If I do not come back, you will know that he has refused. Wait then no more than one day; then leave the country as quickly as you can. It is death for strangers to remain in the vicinity of Tuen-Baka."
"Come back to my camp," said Tarzan, "and spend the night there. We can discuss the matter with my companions."
Thetan hesitated. "They are all strangers to me," he said, "and all strangers are enemies."
"My friends will not be," the ape-man assured him. "I give you my word that they will have no desire to harm you. In the world from which they come no strangers are considered enemies until they prove themselves to be such."
"What a strange world that must be," remarked Thetan. "But I'll accept your word and go with you."
As the two men started back toward the Gregory camp, a party of warriors embarked in a galley at the quay of Ashair, dispatched by Queen Atka to intercept and harass the Gregory expedition, against which Atan Thome had warned her in order that he might win the favor of the Queen and prevent Tarzan and Gregory from reaching Ashair. The wily Eurasian had hopes of so ingratiating himself with the Queen that he might remain in Ashair until he could formulate a plan for stealing The Father of Diamonds and making his escape. So obsessed was he by his desire to possess the diamond, that he was totally unable to appreciate the futility of his scheme.
The members of the Gregory party were astonished to see Tarzan walk into camp with this strangely appareled warrior. Thetan wore the black plumes of Thobos, and upon the breast and back of his tunic there was embroidered the figure of a bull. Their friendly greetings put him at his ease, and though the Swahili of Gregory, Helen and Lavac was a little lame, they all managed fairly well in the conversation that ensued. He told them much of Tuen-Baka, of Thobos and Ashair; but when the subject of The Father of Diamonds was broached, he was evasive; and, out of courtesy, they did not press him. But his reticence only served to whet their curiosity, as they sensed the mystery that surrounded the fabulous stone.
Late that night the silence of the sleeping camp was broken by sepulchral voices keening out of the mystery of the surrounding darkness. Instantly the camp was awake and in confusion, as the terrified natives milled in panic. So terrified were they that they might have bolted for the forest had it not been that glowing death's-heads suddenly appeared floating in the air around the camp, as the voices warned, "Turn back! Turn back! Death awaits you in forbidden Ashair."
"The Asharians!" cried Thetan.
Tarzan, seeking to solve the mystery of the weird apparitions, sprang into the night in the direction of the nearest death's-head. D'Arnot sought to rally the askaris; but they were as terrified as the porters, many of whom crouched with their foreheads pressed to the ground, while others covered their ears or their eyes with trembling hands.
Into the midst of this confusion burst half a dozen Asharnn warriors. The whites met them with drawn pistols. Wolff fired and missed; then the intruders were gone as suddenly as they had come. Above the turmoil of the camp rose a woman's terrified scream.
Pursuing the grinning skull into the darkness, the ape-man seized a flesh and blood man, as he had expected. The fellow put up a fight; but he was no match for the steel thewed man of the jungles, who quickly disarmed him and dragged him back into camp.
"Look!" said Tarzan to the natives, pointing to the phosphorescent mask of his prisoner. "It is only a trick; you need be afraid no more. He is a man, even as you and I." Then he turned to his prisoner. "You may go," he said. "Tell your people that we do not come as enemies, and that if they will send Brian Gregory out to us, we will go away."
"I will tell them," said the warrior; but when he was safely out of the camp, he called back, "You will never see Brian Gregory, for no stranger who enters The Forbidden City ever comes out alive."
"We are well out of that," said Gregory, with a sigh. "I don't take much stock in what that fellow just said. He was just trying to frighten us. That was what the voices and the death's-heads and the raid were for, but for a while I thought that we were in for a lot of trouble."
"Who screamed?" asked Tarzan.
"It sounded like one of the girls," said Lavac, "but it may have been a porter. They were scared nearly to death."
It was then that Magra came running toward them. "Helen is gone!" she cried. "I think they got her," and at that very moment Asharian warriors were dragging Helen into a galley at the edge of the river only a short distance from the camp. During the confusion they had deliberately caused in the Gregory camp, a warrior had seized Helen; and then they had all made off for the river where the galley lay. A palm over her mouth had silenced the girl; and she was helpless against their strength, as they hurried her aboard the craft.
"Come!" cried Thetan. "Their galley must be close by in the river. We may be able to overtake them before they can put off," and, followed by the others, he ran from the camp; but when they reached the river, they saw the galley already out of their reach and moving steadily up stream beneath the steady strokes of its long oars.
"Mon Dieu!" exclaimed d'Arnot. "We must do something. We cannot let them take her away without doing something."
"What can we do?" asked Gregory in a broken voice.
"I am afraid you will never see her again," said Thetan. "She is beautiful; so they will probably take her to the temple of The Father of Diamonds to be hand-maiden to the priests. No alien who enters there ever comes out alive. Tomorrow, she will be as dead to the outer world as though she had never existed."
"Is there no way to overtake them?" asked Tarzan.
"Wait!" exclaimed Thetan. "There is a bare possibility. If they camp tonight this side of the tunnel that leads into Lake Horus we might be able to do so; but it is a hard trail, and only strong men could travel it."
"Will you guide me?" asked Tarzan.
"Yes," replied Thetan, "but what can we two alone expect against a galley load of Asharian warriors?"
For answer, Tarzan raised his face toward the heavens and voiced a weird cry; then he turned to d'Arnot. "Come," he said, "you will go with us."
"I'll go, too," said Lavac. "You'll need all the men you can get."