She had stopped now and dismounted, and they were leading their horses down a steep, scrambling place with the stars showing overhead.
"A blowhole," Marian informed him briefly.

"We'll come into another cave, soon, and while it's safe if you know it, I'll explain now that you must walk ahead of your horse and keep your right hand always in touch with the wall until we see the stars again.

There's a ledge-five feet wide in the narrowest place, if you are nervous about ledges--and if you should get off that you'd have a drop of ten feet or so.

We found that the ledge makes easier travelling, because the bottom is full of rocks and nasty depressions that are noticeable only with lights." She started off again, and Bud followed her, his gloved fingers touching the right wall, his soul humbled before the greatness of this little woman with the deep, troubled eyes.

When they came out into the starlight she stopped and listened for what seemed to Bud a very long time.
"If they are coming, they are a long way behind us," she said relievedly, and remounted.