seen so many at one time," Sue's mother said.

"What are they?" Sue asked.

"Our ships, of course. From every part of the globe. They'll circle the planet constantly. They are the final inner ring. Under them is nothing but the ground defenses."

"Are there more ships farther out?"

"Certainly. Those up there are comparable to the Fourth Sector on a cosmograph. Sectors Three, Two and One will extend out beyond Pluto's orbit. They are probably fighting now. Listen! There's the warning. We must go to the shafts."

At that moment Alfred Wilson appeared. She understood that he had come to say goodby to his mother. He came straight toward her, and then Sue realized she was alone. Her mother, with an understanding smile, was already on the way to the shaft.

Sue thought that he had never looked so tall, so strong, so confident. She was certain he had his orders to go out.

He stood before her. His jaw was set, his expression grim. Then his lips parted and he spoke very softly:

"Don't take any worries with you down in the ground," he said. "We'll never let them get a foothold on Earth." He paused. "Sue, don't think about me, don't think about love, don't think about anything—but just one kiss."

She clung to him, giving of her lips, of every thought, of every heartbeat. It seemed to her that it was the least she could do. In another hour he would be out there between her and the Zeehites.

The second warning sounded. She ignored it, still willing to give, to sacrifice herself if necessary, but he unclasped her hands and brought her arms from about him.

He looked once more into her eyes and then hurried toward the groundcar, walking very straight. He didn't look back and at last she turned and ran to the shaft.

The trip down required nearly ten minutes. The deceleration began long before the car stopped. She knew that her mother, and other older women, wouldn't be sent down this far, but that children would go much farther.

She hoped she would be put off at a level where there was machinery, where she could work, where there would be something to do to keep her mind off the coming terror.

As she came 

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