The House on the Borderland

Very cautiously, I crept forward, and peered down; but could see nothing. Then, I crossed to the left of the passage, to see whether there might be any continuation of the path. Here, right against the wall, I found that a narrow track, some three feet wide, led onward. Carefully, I stepped on to it; but had not gone far, before I regretted venturing thereon. For, after a few paces, the already narrow way, resolved itself into a mere ledge, with, on the one side the solid, unyielding rock, towering up, in a great wall, to the unseen roof, and, on the other, that yawning chasm.