Perhaps--perhaps Pierre himself had discovered her, but having vowed never to see her again, he cared for her like the invisible hands in the old Greek fable.
This, again, an instinctive knowledge made her dismiss.

If he were so close, loving her, he could not stay away; she read in her own heart, and knew.

Then it must be something else; evil, because it feared to be seen; not wholly evil, because it surrounded her with care.
At least this new emotion obscured somewhat the terror and the sorrow of Wilbur's disappearance.

She cooked her breakfast as if obeying the order of the unseen, climbed into the saddle of Wilbur's horse, and started off up the valley, leading her own mount.
Every moment or so she turned in the saddle suddenly in the hope of getting a glimpse of the follower, but even when she surveyed the entire stretch of country from the crest of a low hill, she saw nothing--not the least sign of life.
She rode slowly, this day, for she was stiff and sore from the violent journey of the night before, but though she went slowly, she kept steadily at the trail.

It was a broad and pleasant one, being the beaten sand of the river-bottom; and the horse she rode was the finest that ever pranced beneath her.
His trot was as smooth and springy as the gallop of most horses, and when she let him run over a few level stretches, it was as if she had suddenly been taken up from the earth on wings.