Ann Radcliffe, The Mysteries of Udolpho — Volume III, Chapter III
“ Emily retired within her chamber, while they passed the casement. When she returned to it, all was again quiet. It was now very late, she was wearied with watching, and began to doubt the reality of what she had seen on the preceding night; but she still lingered at the window, for her mind was too perturbed to admit of sleep. The moon shone with a clear lustre, that afforded her a complete view of the terrace; but she saw only a solitary centinel, pacing at one end of it; and, at length, tired with expectation, she withdrew to seek rest. ”
