They crept swiftly along the rocky step where the deep angle was in shadow. They reached the rear slope where Chet had climbed. And each one knew without the speaking of a word that retreat was not to be considered. The open arena!--the high bank of great steps in their bold markings of black and white! They could never hope to scale them; they would never even reach them alive, for the savage horde would overwhelm them before they had crossed the Earth-lit ground. "All right," said Chet in acceptance of their unspoken thoughts, "up it is! Here's a hand, Diane--up you go! Now watch your step, and climb as if a thousand devils were after you, for there's all of that!" The wave of bodies was washing against the pyramid's base when Chet drew Kreiss, the last of the four, into the shadow of the huge capstone. The noise of their climbing had been covered by the wailing cry that came piercing shrilly from the throng far below. And they had been unseen, Chet was sure; unless the one furtive shadow that he had seen draw away from the crowd and slip around toward the rear of the pyramid meant that some one of the tribe had found their trail. From the front of the shadowed top came the shuffling of heavy, dragging feet on the stone. It was the same as before. Chet had held some vague idea of fighting off the horde from the top of the steps, for here was the only place where they could ascend. He had forgotten this other one for the moment, and he realized in a single flashing instant that here was a worse menace than the pack. Only one, it was true, one ape-man who would be no match for them! But Chet remembered those blind, staring eyes and the message that had come to him. Those eyes had seen the horrible food upon the altar; some other brain had seen it too. The ape-man was an instrument only; there was some hidden horror in back of him, something that saw with his eyes, something that must never see them, cowering and huddled in the shadow of that great stone. * * * * * The shuffling was coming from the right; Chet clutched silently at the others to draw them away and toward the left. They retreated to the corner, turned it, and went on toward the front; then stopped in silent waiting where the shadow ended. The front, where the altar stood, was in the full glare of Earth. For the moment they were safe, but what of the time when the ape-man returned? He had descended to the ground; when he climbed back again would he retrace his steps? Or would he come this side and trap them here where the light of their own Earth made any forward step impossible? Below them the wailing ceased. Chet leaned forward to see the black horde, silent and motionless. Approaching them was the "big ape" he had seen at the altar. His hands were reaching blindly before him and he moved as would a human when entranced.