“The slab was closed as it had been the day before, nor was there trace of its having opened. No trace? Even as I thought this Edith dropped to her knees before it and reached toward something lying at its foot. It was a little piece of gay silk. I knew it for part of the kerchief Thora wore about her hair. She lifted the fragment. It had been cut from the kerchief as though by a razor-edge; a few threads ran from it⁠—down toward the base of the slab; ran on to the base of the grey rock and⁠—under it!

“The grey rock was a door! And it had opened and Thora had passed through it!

“I think that for the next few minutes we all were a little insane. We beat upon that portal with our hands, with stones and sticks. At last reason came back to us.