explanation of Sarkoff's memory. The important fact was that Sarkoff's body was not in its grave. Where so much was unknown, this was one indisputable fact. The thing that was on the ship must be placed not only under heavy guard but in a cage from which escape was impossible. Then an examination could begin. There was evil on this world. The trees, the vegetation, the ground under his racing feet, was evil. In his calmer moments Jed Hargraves would have said that evil was another word for danger. He wasn't calm now. The panic he had been rigidly excluding from his mind had burst the dam he had built before it. He could feel danger in the air. It was in the dawn, in the light of the sky. It was everywhere. He and his companions were aliens on this world, and the planet was striking at them, striving to eliminate them, contriving to destroy them. He heard it before he saw it. Something was grunting in the air. Above the tops of the trees something was grunting. He needed seconds to recognize the sound. Then he recognized it. And jerked himself to a halt, his eyes wildly probing upward. He saw it. The ship. The grunting roar had come from the Kruchek drivers fighting the gravity of the planet. The ship had taken off without them. Had Nielson gone mad? Had he seen danger approaching and jumped the ship into the sky to escape it? "Wait! Nielson! Pick us up!" The ship flew on. Gaining speed, it passed over their heads. They caught another glimpse of it as it passed over an opening in the branches of the trees. Then it was gone, the throb of the drivers dying quickly away. "Nielson will come back for us." Noble's voice, usually poised and assured, was garbled. "He'll return and pick us up. He won't leave us here." "He had some reason for taking off," Hargraves heard himself saying. "He'll come back. He has to." Subconsciously he knew that this, at the very best, was wishful thinking. The ship had no more than vanished until another sound came to their ears, that of men shouting. A group came into sight among the trees, following along the ground the course the ship had taken through the air. "They're our fellows!"