khaki-clad soldiers in them were already disembarking. "I imagine that all over the world the sky turned a little brighter. It must have been apparent at once."

The leader of the 'copter men reached them. He was a tall, bronzed man, wearing the service coveralls and markings of a captain of the Air Force. He stretched out his hand. "You must be the Dennings. I'm Captain Saunders. I've been asked to bring you back with me right away so that we can get a complete report on this affair. How fast can you get ready?"

"Why," said Burl, "we're ready right now. As soon as we can dump our packs aboard. But, gee, you mean go back—where?"

Saunders smiled grimly. "To California. We just left there. I have been given urgent orders to waste no time. So will you oblige?"

The two Dennings looked at each other. This was important, all right. They realized that these planes had flown on fast rockets the instant the sky had cleared. Possibly there was still a crisis—one they had not heard of.

They did not pause to ask further questions. Mark Denning asked the captain to dispatch one of his 'copters to the camp beyond the mountains to tell Gonzales to load up and start back for Lima. This order given, the two Dennings climbed into the rocket 'copter, and Saunders took the controls.

With a whoosh, the squat craft lifted on its rockets, its jet-driven fan carried it up, folded, and the rocket engine took over. On upward into the stratosphere they hurtled, across the Western Hemisphere, across the face of jungle and isthmus, across the barren mountains of Mexico, and in a matter of less than half an hour, settled down in the wide green field of a U.S. Air Force base in southern California. It was all so swift, so sudden, that to Burl it seemed like a dream. There had been so many days in the field, in the peace and quiet of the high mountains of the Andes. There had been the slow hunting around age-worn ruins; the careful, deliberate sifting of tons of soil and sand for tiny shards; then this: the urgent message, the trek, the weird building, the strange, body-filling shock, and the control over the Sun-theft globes, followed by the swift transition over thousands of miles.

Here he was in his home country—weeks sooner than he had expected—but not to return to his home and school. No, for he felt that somehow an adventure was beginning that could lead anywhere. Perhaps his adventure had actually ended, but he saw now that he would be 

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