The opposite side of the street in the full moonlight stared emptily.

No! Unless she were an illusion herself and his whole chase a dream, she MUST have entered here.
But the chase was not hopeless.

He had at least tracked her to a place where she could be identified.

It was not a hotel, which she could leave at any moment unobserved.

Though he could not follow her and penetrate its seclusion now, he could later--thanks to his old associations with the padres of the contiguous college--gain an introduction to the Lady Superior on some pretext.