He tried to run again, and the darkbird touched him. Once more there was the unbearable twitching of the nerves and he danced in the black, bright, day, night. He danced into a large box that was waiting for him, and he kept going until he struck the end wall of hard metal. He turned then, and saw the very thick door go sighing shut and the dogs go slipping into place snick-snick one after the other, and it was too late even to try to get out again. He set Susan down as gently as he could and sank down beside her. The floor moved up under him sharply. There was a bonging and clattering of tackle overhead, and then a sickening sidewise lurch. The on-off pattern of the light changed outside the two round windows that were in the box. It became a steady green, in which his hands showed like two sickly-white butterflies on his knees. There were more noises, hollow and far away, and then a second lurch, a lift, a drop, and after that a larger motion encompassing the box and the entire locus in which it stood. Durham put his face in his hands and gave up. V Susan was screaming. Let me out, let me out. She was pounding on something. Durham started up. He must have slept or passed out. The box was perfectly still now. There was no sense of motion. But he could tell by the change in gravity that the ship was in space. Susan was by one of the windows. She was pounding on it with her favorite implement, the heel of her shoe. Durham went to her and glanced out. Cold sweat broke out on him, and he grabbed her hand. "Stop it! Are you crazy?" He wrenched the shoe from her and threw it across the small space of the box. Then he felt of the glass, peering at it, frantic lest she should have cracked it. "I'm going to get out," said Susan grimly, and groped around for something heavier. "Look." He shook her and turned her face to the window. "Do you see that air out there?" The box now stood in a large empty hold. He could see the curve of the ship's hull, ribbed with tremendous struts of steel, and a deck of metal plates, glistening in the green light. _Green_ light? Earth ships have a yellow-white type light, the kind that the sun gives off. Well, yes--but suppose that the sun was green? Nanta Dik circles a green star. So does Senya Dik. Those creatures outside the ship were anything but humanoid. Jubb's darkbird herded us in here. Easy. Now we know. "What about the air?" asked Susan. "Let go of me." "It's poisonous. Can't you tell by looking at it?" It rolled and roiled and sluggishly shifted in vapors of thick chartreuse and vivid green. "And don't you remember, they were wearing pressure suits? They couldn't live in our atmosphere. We surely couldn't live in theirs." There was no answer. "Susan. Susan?" "I want to go home," she said, and began to cry. "There now, Susie. Take it--" "Don't call me Susie!" "All right, but take it easy. I'll find out what the situation is and then I'll--"