that had been in the object from the sky. He wouldn't be looking after Jill.

Lockley found himself straining his eyes at the mountain from whose flank Vale had been prepared to measure the base line between his post and Lockley's. That vantage point could not be seen from here, but Lockley looked for a small figure that might be Jill, climbing valiantly to warn Vale of the events he'd known before anybody else.

Then Lockley heard a very small sound. It was faint, with an irregular rhythm in it. It had the cadence of speech. His pulse leaped suddenly. There was the mast for the short wave set by which the camp had kept in touch with the outer world. Lockley sprinted for the building under it. His footsteps sounded loudly in the silent camp, and they drowned out the sound he was heading for.

He stopped at the open door. He heard Jill's voice saying anxiously, "But I'm sure he'd have come to make certain I was safe!" A pause. "There's no one else left, and I want...." Another pause. "But he was up on the mountainside! At least a helicopter could—"

Lockley called, "Jill!"

He heard a gasp. Then she said unsteadily, "Someone just called. Wait a moment."

She came to the door. At sight of Lockley her face fell.

"I came to make sure you were all right," he said awkwardly. "Are you talking to outside?"

"Yes. Do you know anything about—"

"I'm afraid I do," said Lockley. "Right now the important thing is to get you out of here. I'll tell them we're starting. All right?"

She stood aside. He went up to the short wave set which looked much like an ordinary telephone, but was connected to a box with dials and switches. There was a miniature pocket radio—a transistor radio—on top of the short wave cabinet. Lockley picked up the short wave microphone. He identified himself. He said he'd come to make sure of Jill's safety, and that he'd been passed by the rushing mass of cars and trucks that had evacuated everybody else. Then he said, "I've got a car about four miles away. It's in a ditch, but I can probably get it out. It'll be a lot safer for Miss Holmes if you send a helicopter there to pick her up."

The reply was somehow military in tone. It sounded like a civilian being authoritative about something he knew nothing about. Lockley said, "Over" in a dry tone and put down the microphone. He picked up the pocket radio and put it in his pocket. It might be useful.

"They say to try to make it out in my car," he told Jill wryly. "As civilians, I suppose they haven't any helicopters they can give orders to. But it probably makes sense. If there are some queer creatures around, there's no point in stirring them up with a flying contraption banging around near their landing place. Not before we're ready to take real action. Come along. I've got to get you away from here."

"But I'm waiting...." She looked distressed. "He wanted me to leave yesterday. We almost quarrelled about it. He'll surely come to make sure I'm safe...."

"I'm afraid I have bad news," said Lockley. Then he described, as gently as he could, his last talk with Vale. It was the one which ended with squeaks and strugglings transmitted by the communicator, and then the smashing of the communicator itself. He didn't mention the puzzling fact that the communicator had stayed perfectly aimed while it was picked up and squeaked at and destroyed. He had no explanation for it. What he did have to tell was bad enough. She went deathly pale, searching his face as he told her.

"But—but—" She swallowed. "He might have been hurt and—not killed. He might be alive and in need of help. If there are creatures from somewhere else, they might not realize that he could be unconscious and not dead! He'd make sure about me! I—I'll go up and make sure about him...."

Lockley hesitated. "It's not likely," he said carefully, "that he was left there injured. But if you feel that somebody has to make sure, I'll do it. For one thing, I can climb faster. My car is ditched back yonder. You go and wait by it. At least it's farther from the lake and you should be safer there. I'll make sure about Vale."

He explained in detail how she could find the car. Up this hillside to a slash through the forest for a highway. Due south from an abandoned bulldozer. Keep out of sight. Never show against a skyline.

She swallowed again. Then she said, "If he needs help, you could—do more than I can. But I'll wait there where the woods begin. I can hide if I need to, and I—might be of some use."

He realized that she deluded herself with the hope that he, Lockley, might bring an injured Vale down the mountainside and that she could be useful then. He let her. He went through the camp with her to put her on the right track. He gave her the pocket radio, so she could listen for news. When she went on out of sight in brushwood, he turned back toward the mountain on which Vale had occupied an observation post. It was actually a million-year-old crater wall that he climbed presently. And he took a considerable chance. As he climbed, for some time he moved in plain view. If the crew of the ship in Boulder Lake were watching, they'd see him rather than Jill. If they took action, it would be against him and not Jill. Somehow he felt better equipped to defend himself than Jill would be.

He climbed. Again the world was completely normal, commonplace. There were mountain peaks on every hand. Some had been volcanoes originally, some had not. With each five hundred feet of climbing, he could see still more mountains. The sky was cloudless now. He climbed a thousand feet. Two. Three. He could see between peaks for a full thirty miles to the spot where he'd been at daybreak. But he was making his ascent on the back flank of this particular mountain. He could not see Boulder Lake from there. On the other hand, no creature at Boulder Lake should be able to see him. Only an exploring party which might otherwise sight Jill would be apt to detect him, a slowly moving speck against a mountainside.

He reached the level at which Vale's post had been assigned. He moved carefully and cautiously around intervening masses of stone. The wind blew past him, making humming noises in his ears. Once he dislodged a small stone and it went bouncing and clattering down the slope he'd climbed.

He saw where Vale could have been as he watched something come down from the sky. He found Vale's sleeping bag, and the ashes of his campfire. Here too was the communicator. It had been smashed by a huge stone lifted and dropped upon it, but before that it had been moved. It was not in place on the bench mark from which it could measure inches in a distance of scores of miles.

There was no other sign of what had apparently happened here. The ashes of the fire were undisturbed. Vale's sleeping bag looked as if it had not been slept in, as if it had only been spread out for the night before. Lockley went over the rock shelf inch by inch. No red stains which might be blood. Nothing....

No. In a patch of soft earth between two stones there was a hoofprint. It was not a footprint. A hoof had made it, but not a horse's hoof, nor a burro's. It wasn't a mountain sheep track. It was not the track of any animal known on earth. But it was here. Lockley found himself wondering absurdly if the creature that had made it would squeak, or if it would roar. They seemed equally unlikely.

He looked cautiously down at the lake which was almost half a mile below him. The water was utterly blue. It reflected only the crater wall and the landscape beyond the area where the volcanic cliffs had fallen. Nothing moved. There was no visible apparatus set up on the shore, as Vale had said. But something had happened down in the lake. Trees by