The three men passed through the outer wall and entered the courtyard, across which they saw the lofty inner wall rising before them. Romero was the first to find the opening that led to the city proper and, calling to his fellows, he stepped boldly into the narrow passage. Then once again the hideous scream shattered the brooding silence of the ancient temple.

The three men halted. Zveri wiped the perspiration from his brow. "I think we have gone as far as we can alone," he said. "Perhaps we had all better go back and rally the men. There is no sense in doing anything foolhardy." Miguel Romero threw him a contemptuous sneer, but Ivitch assured Zveri that the suggestion met with his entire approval.

The two men crossed the court quickly without waiting to see whether the Mexican followed them or not and were soon once again outside the city.

"Where is Miguel?" asked Ivitch.

Zveri looked around. "Romero!" he shouted in a loud voice, but there was no reply.

"It must have got him," said Ivitch with a shudder.

"Small loss," grumbled Zveri.

But whatever the thing was that Ivitch feared, it had not, as yet, gotten the young Mexican, who, after watching his companions' precipitate flight, had continued on through the opening in the inner wall determined to have at least one look at the interior of the ancient city of Opar that he had travelled so far to see and of the fabulous wealth of which he had been dreaming for weeks.

Before his eyes spread a magnificent panorama of stately ruins, before which the young and impressionable Latin-American stood spellbound; and then once again the eerie wail rose from the interior of a great building before him, but if he was frightened Romero gave no evidence of it. Perhaps he grasped his rifle a little more tightly; perhaps he loosened his revolver in his holster, but he did not retreat. He was awed by the stately grandeur of the scene before him, where age and ruin seemed only to enhance its pristine magnificence.

A movement within the temple caught his attention. He saw a figure emerge from somewhere, the figure of a gnarled and knotted man that rolled on short crooked legs; and then another and another came until there were fully a hundred of the savage creatures approaching slowly toward him. He saw their knotted bludgeons and their knives, and he realized that here was a menace more effective than an unearthly scream.