"You mean that it's an effect of light, I suppose?"
"Perhaps it is. But the inexplicable part of the matter is that it makes no difference whether the moon is rising or setting, or waxing or waning. If there's any moonlight at all, from east or west or overhead, so long as it shines on the grave you can see the outline of the body on top."
Holger stirred up his pipe with the point of his knife, and then used his finger for a stopper. When the tobacco burned well he rose from his chair.
"If you don't mind," he said, "I'll go down and take a look at it."
He left me, crossed the roof, and disappeared down the dark steps. I did not move, but sat looking down until he came out of the tower below. I heard him humming an old Danish song as he crossed the open space in the bright moonlight, going straight to the mysterious mound. When he was ten paces from it, Holger stopped short, made two steps forward, and then three or four backward, and then stopped again. I know what that meant. He had reached the spot where the Thing ceased to be visible—where, as he would have said, the effect of light changed.
Then he went on till he reached the mound and stood upon it. I could see the Thing still, but it was no longer lying down; it was on its knees now, winding its white arms round Holger's body and looking up into his face. A cool breeze stirred my hair at that moment, as the night wind began to come down from the hills, but it felt like a breath from another world.
The Thing seemed to be trying to climb to its feet, helping itself up by Holger's body while he stood upright, quite unconscious of it and apparently looking toward the tower, which is very picturesque when the moonlight falls upon it on that side.
"Come along!" I shouted. "Don't stay there all night!"
It seemed to me that he moved reluctantly as he stepped from the mound, or else with difficulty. That was it. The Thing's arms were still round his waist, but its feet could not leave the grave. As he came slowly forward it was drawn and lengthened like a wreath of mist, thin and white, till I saw distinctly that Holger shook himself, as a man does who feels a chill. At the same instant a little wail of pain came to me on the breeze—it might have been the cry of the small owl that lives among the rocks—and the misty presence floated swiftly back from Holger's advancing figure and lay once more at its length upon the mound.
Again I felt the cool breeze in my hair, and this time an icy thrill of dread ran down my spine. I remembered very well that I had once gone down there alone in the moonlight; that presently, being near, I had seen nothing; that, like Holger, I had gone and had stood upon the mound; and I remembered how, when I came back, sure that there was nothing there, I had felt the sudden conviction that there was something after all if I would only look behind me. I remembered the strong temptation to look back, a temptation I had resisted as unworthy of a man of sense, until, to get rid of it, I had shaken myself just as Holger did.