Waiting for what? Chet was making demands upon his reason that was already taxed beyond its capacity. He heard nothing, and he knew with entire certainty that there was no audible call, yet he sensed the message at the instant the ape-man moved. "Flesh!" said the message. "Bring flesh! Bring it now!" And, with glazed, wide-open eyes which plainly saw, but could not comprehend, the ape-thing stared at the altar-stone. It bent forward, took the fresh-killed body by the throat, and slung it across one shoulder as easily as a child might handle a doll; then it turned and vanished once more into the waiting dark. "God!" breathed Chet when the vision had passed. "God help us! What does it mean?" He took one backward step, then another, and made his way in silence along the path he had come. He must get back to the others to tell them of what he had seen; to help them to flee from this place of horror that was more terrible for its qualities of the unknown. * * * * * He gave his companions the story in staccato sentences. "And the ape-man was unconscious," he concluded; "he was an automaton only, directed by another brain. I know it. I got that message, I tell you; it was radioed by someone or by something--sent direct to that big ape's brain. "Now let's get out of here. Diane had it right when she said that the place was evil. But she didn't make it strong enough. It's foul with evil! It's damned! Come on, I'm leaving now!" Chet's whispered words were uttered with all the emphasis that horror could instill. He knew that he spoke truth. But he could not know how mistaken was his last positive assertion. "I'm leaving now!" Chet had said, and how desperately he wanted to put this place behind him only he himself could know. He took one step toward the place where they could descend; then Harkness' hand pulled him roughly to his knees. "Down!" Harkness was commanding; "get down, Chet! They're coming--a swarm of them--through the gate!" The pilot heard them before he saw them. They began a chant as they poured through the entrance, a weird, wailing note like the cry of a stricken animal that cries on and on. Then he saw the swarm. They came in a cataract of black bodies that spilled through that stone portal and down the long slope. They formed a ragged column on the ground and came on toward the pyramid, where, unseen, three men and a girl from another world were crouching. "Back!" Chet ordered in a whisper. "Keep low--in the shadow! Get around in back of the pyramid. We can make a run for it!" * * * * *