“I see.” Mitchell stroked his chin thoughtfully. “Do you know the instrument’s sending capacity, Miss Deane?”
She thought before answering. “I believe about one hundred miles, but I am not certain. Miss Porter and I generally used the instrument to receive messages.”
“But you have sent messages?”
“Yes, occasionally.”
“To whom did you send a message last night, Miss Deane?”
Dorothy’s reply was prompt. “To no one.”
Mitchell smiled, not unkindly. “I’m afraid denial won’t do any good. I saw you and Miss Porter in the attic at the Porter mansion last night.”
“You saw us?” Dorothy’s surprise was unmistakable, and Mitchell chuckled. “Where were you?”
“In Dr. Thorne’s dining-room, the window of which overlooks that side of the Porter mansion.” There was a brief pause, and then Mitchell repeated his former question. “To whom did you send a message last night?”
“I sent no wireless message last night,” reiterated Dorothy.