"Yes."
"Might I take a peep at the consulting room?"
"Certainly, Inspector."
From the waiting-room they went up a short flight of stairs into the small apartment in which Stuart saw his patients. Dunbar looked slowly about him, standing in the middle of the room, then crossed and stared out of the window into the narrow lane below.
"Where were you when he gave you the envelope?" he snapped suddenly.
"At the table," replied Stuart with surprise.
"Was the table-lamp alight?"
"Yes. I always light it when seeing patients."
"Did you take the letter into the study to seal it in the other envelope?"
"I did, and he came along and witnessed me do it."