With equal suddenness, and with terrible clearness, Dean found the answer to one of his questions. He wrenched himself about to stare behind him at the creature that held him in its grip. And, for the first time, the wild experience became something more than an unbelievable nightmare; in that one horrifying instant he knew it was true.

Only a few minutes before, he had been walking across the cindery sand of the crater top, walking under the stars and the dark desert sky—Dean Rawson, mining engineer, in a sane, believable world. And now...!

He squinted his eyes in the dim light to see more plainly the beastly figure, more horrible for being so nearly human. He had seen them briefly up above; the closer view of this one specimen of a strange race was no more pleasing. For now he saw clearly the cruelty in the face. It was there unmistakably, even though the face itself, under less threatening circumstances, might have been a ludicrous caricature of a man's.

Red and nearly naked, the creature stood upright, straps of metal about its body. It was about Rawson's height; its round, staring eyes were about level with his own, and each eye was centered in a circular disk of whitish skin. The light went dim for a moment, and Dean, staring in his turn, saw those other huge eyes enlarge, the white covering of each drawing back like an expanding iris.

Some vague understanding came to him of the beast's ability to see in the dark. They used these red-hot stones for illumination, but this thing had seemed to see clearly even when the stones had ceased to glow. And again, though indistinctly, Dean knew that those eyes might be sensitive to infra-red radiations—they might see plainly by the dark light that continued to flood these rocky chambers, though, to him, the rocks had gone lightless and black.


ven as the quick thoughts flashed through his mind, he was thinking other thoughts, recording other observations.

The rest of the face was red like the body; the head was sharply pointed, and crowned with a mass of thin, clinging locks of hair. The mouth, a round, lipless orifice, contracted or dilated at will; from it came whistling words.

Out of the darkness, giant things were leaping. They clutched at Rawson, while the first captor released his hold and drew back. Taller, these newcomers were, bigger, and different.