“Capital!” said Nick, with manifest satisfaction. “From where you sit, Lady Deland, by glancing into the mirror over the fireplace, I think you can see into the study.”
“Yes, sir, I can.”
“You can do so, I observe by merely turning your eyes in the direction of the mirror.”
“I can, Mr. Carter.”
“If you were to do so merely casually, a person seated here would have no idea that you were in communication with a person in the study,” said Nick. “By turning my chair in this direction, I can see the mirror, but not the study door, nor any reflection of it.”
“Oh, I now see what you mean,” Lady Deland exclaimed. “You wish to signal me from the study, by means of the mirror, while I am talking with the person you suspect will come here.”
“Exactly,” Nick replied. “I will stand so that you can see a reflection of me, and I will signify with a nod, or with a negative shake of my head, what course you must shape.”
“I understand you perfectly.[{37}]”
“It will be necessary for you to yield to whatever design may be attempted.”
“Have you any idea of what it will consist?”