There! His palm struck flat against a smooth surface. He swept out his hand--and suddenly it passed over emptiness. Ross explored by touch. There _was_ a door and now it was open. For a moment he hesitated, upset by a nagging little fear that if he stepped through he would be out on the hillside with the wolves. "That's stupid!" Again he spoke aloud. And, just because he did feel uneasy, he moved. All the frustrations of the past hours built up in him a raging desire to do something--anything--just so long as it was what _he_ wanted to do and not at another's orders. Nevertheless, Ross continued to move slowly, for the space beyond that open door was as deep and dark a pit as the room he left. To squeeze along one wall, using an outstretched arm as a guide, was the best procedure, he decided. A few feet farther on, his shoulder slipped from the surface and he half tumbled into another open door. But there was the wall again, and he clung to it thankfully. Another door ... Ross paused, trying to catch some faint sound, the slightest hint that he was not alone in this blindman's maze. But without even air currents to stir it, the blackness itself took on a thick solidity which encased him as a congealing jelly. The wall ended. Ross kept his left hand on it, flailed out with his right, and felt his nails scrape across another surface. The space separating the two surfaces was wider than any doorway. Was it a cross-corridor? He was about to make a wider arm sweep when he heard a sound. He was not alone. Ross went back to the wall, flattening himself against it, trying to control the volume of his own breathing in order to catch the slightest whisper of the other noise. He discovered that lack of sight can confuse the ear. He could not identify those clicks, the wisp of fluttering sound that might be air displaced by the opening of another door. Finally, he detected something moving at floor level. Someone or something must be creeping, not walking, toward him. Ross pushed back around the corner. It never occurred to him to challenge that crawler. There was an element of danger in this strange encounter in the dark; it was not meant to be a meeting between fellow explorers. The sound of crawling was not steady. There were long pauses, and Ross became convinced that each rest was punctuated by heavy breathing as if the crawler was finding progress a great and exhausting effort. He fought the picture that persisted in his imagination--that of a wolf snuffling along the blacked-out hall. Caution suggested a quick retreat, but Ross's urge to rebellion held him where he was, crouching, straining to see what crept toward him.