"Suppose," said Jill, "that they aren't monsters. What then?"

"Then," said Lockley, "it's a cold war device, to find out if the other side in the cold war can take us over without our suspecting they're the ones doing it. Naturally those in this ship will blow themselves up rather than be found out."

"Which," said Jill steadily, "doesn't offer much hope for...."

She didn't say Vale's name. She couldn't. Lockley grimaced again.

"It's not certain, Jill. The evidence is on the side of the monsters. But in either case the thing for us to do is get to the Army with what I've found out. I've had a stationary beam to test, however crudely. The cordon must have been pushed back by a moving or an intermittent beam. It wouldn't be easy to experiment with one of those. Come on."

She stood up. She followed when he went on. They climbed steep hillsides and went down into winding valleys. The sun began to sink in the west. The going was rough. For Lockley, accustomed to wilderness travel, it was fatiguing. For Jill it was much worse.

They came to a sere, bare hillside on which neither[69] trees nor brushwood grew. It amounted to a natural clearing, acres in extent. Lockley swept his eyes around. There were many thick-foliaged small trees attempting to advance into the clear space. He grunted in satisfaction.

[69]

"Sit down and rest," he commanded. "I'll send a message."

He broke off branches from dark green conifers. He went out into the clearing and began to lay them out in a pattern. He came back and broke off more, and still more. Very slowly, because the lines had to be large and thick, the letters S.O.S. appeared in dark green on the clayey open space. The letters were thirty feet high, and the lines were five feet wide. They should show distinctly from the air.

"I think," said Lockley with satisfaction, "that we might get something out of this! If it's sighted, a 'copter might risk coming in after us." He looked at her appraisingly. "I think you'd enjoy a good meal."

"I want to say something," said Jill carefully. "I think you've been trying to cheer me up, after saying something to arouse me—which I needed. If the creatures aren't monsters, they'll never actually let anybody loose who's seen that they aren't. Isn't that true? And if it 

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