“Do not fire!”

From behind the curtain emerged a white man!

“Father!” gasped Cliff, forgetting all cautions. He and his father, so long separated, were at last rejoined.

Their meeting was joyful; but Cliff lost no time in presenting the gray-haired, weak old scholar to the others—except Bill, who had already visited Mr. Gray.

They were not left long without interruption, but, fortunately, when the tension of a steady step ascending the curved stairs was almost unendurable, a lithe, young soldier, hardly older than the chums, made his appearance, stopping before he reached the top step. He carried a short throwing spear, with its point toward himself, a token of his errand being peaceful.

He explained hurriedly that he was Caya’s older brother, belonging to the Palace guard of picked youths, a sort of picked reserve regiment, called out on occasions such as this.

They liked him at once; but they respected his refusal to come into the Temple. “It is forbidden!” he said, simply, to Bill, and told his story briefly from the steps.

Caya had been caught; she had managed to see him. She sent him to search for the white man, and then, if he found him, to convey him to the temple steps and bid him go up. But Mr. Gray, once free, had come there already.

“I go, then, to my duty,” said the young soldier. “Because you saved my sister—from—the sacrifice—and she is very dear to me, for we are twins!—I will try to save your lives tonight.”

“Do you know the secret way?” asked Bill. “So we can get out of the valley?”