"Oh, Aunt Amy, please! I've got to--" "Upstairs, young man. You've had enough gallivanting around for one day. You're all worn out." "I'm _not_!" said David, struggling. "I feel fine. Look, I just _have_ to--" It was useless. She marched him upstairs to his room and stood in the doorway until he had undressed and put on his pajamas and got into bed. "Now," she said, "you go to sleep. The mountain will still be there in the morning--unless there's a landslide. Good night." And she turned out the light and shut the door. This was awful! He could not sneak downstairs, because the stairs could be seen from the living room. He could not climb out of his window, because a rose arbor was directly beneath it, and he would be ripped by the thorns. And Mother always came in to say good night before she went to bed. If he was not there when she came in tonight, there would be a lot of unpleasant explaining to do. The only thing, then, was to wait until the Scientist went home and everyone was in bed. It was a maddening wait. The Scientist's voice went on and on like the drone of an electric fan, interrupted only by an occasional murmur from Mother or Dad. For a while David sat in bed twisting the sheets in his hands; then he got up and paced the room in his bare feet. It seemed to him that three or four whole nighttimes had passed before he finally heard all three voices raised and talking at once. The Scientist was going! Now they were saying good-by at the front door ... now the door was being closed ... now there were footsteps on the stairs. He jumped into bed just before Mother put her head in and said, "Good night, dear." David murmured, pretending to be half asleep. His door closed again. The light switches snapped, and there was silence. He waited another half hour to make sure everyone was asleep. As quickly and silently as he could, he pulled on his clothes, crept out of his room, and slid cautiously down the bannister. In the back yard he put on his shoes, dived through the hedge, and started to race up the mountainside. Fortunately there was a nearly-full moon and no clouds in the sky. But even with this light, it was not easy to keep to the trail. Several times he lost his way, so that the trip took much longer than usual. But he found the ledge at last, climbed over the final difficult rock, and sat down to catch