It happened so quickly, so unexpectedly, that Little Jon’s cry was almost instantly short as the blackness closed over him. No one knew the hole was there. It hadn’t been there the day before, and in the twilight no one had noticed it.
At the moment it happened, the first shooting stars were crossing the sky – they were beginning to stream across like strings of jewels flung from another planet – and everyone was watching them. The smaller children were exclaiming in delight, while the older ones stood silent and enthralled. Here on the hill, where the valley people often came to watch the glittering night unfold, you could see the whole magic sweep around you, and you felt close to everything in the heavens. Other people, you knew, were standing on other hills on other worlds, watching even as you watched.
Little Jon, whose eyes were quicker than most, should have seen the hole, but all his attention was on the stars. Small for his age, he had moved away from the rest for a better view, and as he stepped backward, there was suddenly nothing under his feet.
It was astonishing at that moment to find himself falling swiftly into the hill at a spot where he had walked safely all his life. But in the brief seconds before the blackness swallowed him, he realized what must have happened: there had been a cave-in over the old Door – the Door that led to another place, the one that had been closed so long.
He cried out and tried to break his fall in the way he had been taught, but the effort came an instant too late. His head struck something, and darkness swirled over him.
Long later, when Little Jon was able to sit up, he had no idea where he was or what had happened. Memory had fled and he ached all over. He would have been shivering with cold, but his thick jacket and trousers and heavy, woven boots kept him warm.
He seemed to be in a narrow cleft of broken rock. There were mossy stones around him, and just ahead he could make out a bed of ferns where water trickled from a spring. He was still too dazed to be frightened, but now he realized he was thirsty, terribly so. He crawled painfully forward and lay with his face in the water while he drank.
--from "The Forgotten Door" by Alexander Key