The stranger's demand to Mrs. Hall

From the text:

"—necessitates a certain retirement. My eyes—are sometimes so weak and painful that I have to shut myself up in the dark for hours together. Lock myself up. Sometimes—now and then. Not at present, certainly. At such times the slightest disturbance, the entry of a stranger into the room, is a source of excruciating annoyance to me—it is well these things should be understood."

"Certainly, sir," said Mrs. Hall. "And if I might make so bold as to ask—"

This information comes from Chapter Two of the novel. If your question pertains to a different chapter, please let me know.