ship sliced across the valley, humming, solid and warm. He moved next to it, very close. One misstep in his running and— "I'll be back," he called to Lyte. He and the ray of light went together. In the early morning the peoples in the caves saw the long finger of orange incandescence and the weird whitish apparition floating, running along beside it. There was muttering and superstition. So when Sim finally reached the cliffs of his childhood he saw alien peoples swarming there. There were no familiar faces. Then he realized how foolish it was to expect familiar faces. One of the older men glared down at him. "Who're you?" he shouted. "Are you from the enemy cliff? What's your name?" "I am Sim, the son of Sim!" "Sim!" An old woman shrieked from the cliff above him. She came hobbling down the stone pathway. "Sim, Sim, it is you!" He looked at her, frankly bewildered. "But I don't know you," he murmured. "Sim, don't you recognize me? Oh, Sim, it's me! Dark!" "Dark!" He felt sick at his stomach. She fell into his arms. This old, trembling woman with the half-blind eyes, his sister. Another face appeared above. That of an old man. A cruel, bitter face. It looked down at Sim and snarled. "Drive him away!" cried the old man. "He comes from the cliff of the enemy. He's lived there! He's still young! Those who go there can never come back among us. Disloyal beast!" And a rock hurtled down. Sim leaped aside, pulling the old woman with him. A roar came from the people. They ran toward Sim, shaking their fists. "Kill him, kill him!" raved the old man, and Sim did not know who he was. "Stop!" Sim held out his hands. "I come from the ship!" "The ship?" The people slowed. Dark clung to him, looking up into his young face, puzzling over its smoothness. "Kill him, kill him, kill him!" croaked the old man, and picked up another rock.