mountainside. [35] 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.[36] 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. [36] 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 the water's edge were bent and broken. Masses of brushwood had been crushed and torn away. Limbs were broken down tens of yards from the water, and there were gullies to be seen wherever there was soft earth. An enormous wave had flung itself against the nearly circular boundary of the lake. It had struck like a tidal wave dozens of feet high in an inland body of water. It was extremely convincing evidence that something huge and heavy had hurtled down from the sky. But Lockley saw no movement nor any other novelty in this wilderness. He heard nothing that was not an entirely normal sound. But then he smelled