I suppose there was other stuff of his among the wreck of rubbish. I didn’t look further. If the books had gone, I knew everything else would have gone too. And Galapas with them.

I went slowly towards the mouth of the cave. I paused by the spring. I could see why there had been no sound; someone had filled in the basin with stones and earth and more wreckage thrown out of the cave. Through it all the water welled still, sluggishly, oozing in silence over the stone lip and down to make a muddy morass of the turf. I thought I could see the skeleton of a bat, picked clean by the water.

Strangely enough, the torch was still on the ledge high beside the mouth of the cave, and it was dry. There was no flint or iron, but I made fire and, holding the torch before me, went slowly inside.

I think my flesh was shivering, as if a cold wind blew out of the cave and went by me. I knew already what I should find.

The place was stripped. Everything had been thrown out to burn. Everything, that is, except the bronze mirror. This, of course, would not burn, and I suppose it had been too heavy to be looted. It had been wrenched from the wall and stood propped against the side of the cave, tilted at a drunken angle. Nothing else. Not even a stir and whisper from the bats in the roof. The place echoed with emptiness.

I lifted the torch high and looked up towards the crystal cave. It was not there.

I believe that for a couple of pulses of the torchlight I thought he had managed to conceal the inner cave, and was in hiding. Then I saw.

The gap into the crystal cave was still there, but chance, call it what you will, had rendered it invisible except to those who knew. The bronze mirror had fallen so that, instead of directing light towards the gap, it directed darkness. Its light was beamed and concentrated on a projection of rock which cast, clear across the mouth of the crystal cave, a black wedge of shadow. To anyone intent only on the pillage and destruction in the cave below, the gap would be hardly visible at all.

“Galapas?” I said, trying it out on the emptiness. “Galapas?”

There was the faintest whispers from the crystal cave, a ghostly sweet humming like the music I had once listened for in the night. Nothing human; I had not expected it. But still I climbed up to the ledge, knelt down and peered in.