The Story of the Glittering Plain by William Morris

When he awoke again the sun shone on him, and the morning was calm and windless. He sat up and looked about him, but could see no signs of Fox save the lair wherein he had lain. So he arose to his feet and sought for him about the crannies of the rocks, and found him not; and he shouted for him, and had no answer. Then he said, "Belike he has gone down to the boat to put a thing in, or take a thing out. " So he went his ways to the stair down into the water-cave, and he called on Fox from the top of the stair, and had no answer.

So he went down that long stair with a misgiving in his heart, and when he came to the last step there was neither man nor boat, nor aught else save the water and the living rock. Then was he exceeding wroth, for he knew that he had been beguiled, and he was in an evil case, left alone on an Isle that he knew not, a waste and desolate land, where it seemed most like he should die of famine.