Read it through once

Perceiving it vain to argue against her insanity, I was planning how I could reach something to wrap about her, without quitting my hold of herself (for I could not trust her alone by the gaping lattice), when, to my consternation, I heard the rattle of the door-handle, and Mr. Linton entered. He had only then come from the library; and, in passing through the lobby, had noticed our talking and been attracted by curiosity, or fear, to examine what it signified, at that late hour.