Billy quietly, though his heart was beating almost to suffocation, slipped a cartridge from the recovered bag into his Arab rifle. He leveled it at the red-robed knife wielders.

"The first man that moves I'll shoot!"

Although the words were as unintelligible to the priests and the cliff-dwellers as any that had gone before, the gesture with which Billy raised the rifle to his shoulder and covered the group was eloquent enough. And as it happened, the delay saved the old man's life; for while they hesitated the sun rushed below the horizon and the swift African night fell. A loud groan from the crowd announced that the hour for the culmination of the sacrifice had passed and that for the time being the intended victim's life was saved.

But for the boys the situation was serious enough. Powerless to resist such numbers they were seized by scores of the winged men and hustled into the passage, which was lit up by blazing torches of the same resinous wood that their guide had used on the first night that they came there. They were hurried along, their feet hardly touching the ground, till they reached one of the diverging galleries. Down this their captors shoved them till they reached a small cubical cell—windowless and without ventilation. Into this they were thrust and a huge stone door that hinged on some contrivance the boys could not understand swung to upon them with a dull bang. But a few minutes later it reopened and another prisoner was thrust in.

It was the aged captive whose life Billy had saved!

This much they saw in the momentary glare of the torches and then as the door closed the darkness—so black that you could feel it—shut down again. But Billy's reportorial curiosity, even in this situation, was still predominant.

"Who are you?" he asked eagerly of the new arrival, whose face he could not see and whose presence he could only guess at by the temporary revelation of the torch-light.

The only answer was a groan; but a few seconds later a voice that sounded strange from long disuse or unaccustomedness to the use of the English language replied:

"I have not heard a white man speak for forty years."

"What?" exclaimed the thunderstruck Billy.