Is There a Way in From the Cliffs?

The fissure ended in another blank wall about fifteen paces further into the ridge. The air was close and still and there was a musty, faintly unpleasant odor that Jane couldn't quite identify. To the left was another wall of flat granite that reached further than Jane could see in the weak light as did the wall to their right. But the difference was the wall on the right side was marked with ledges and broken stones that formed a natural stairway up toward the blackness far above them.