As I watched them Stapleton rose and left the room, while Sir Henry filled his glass again and leaned back in his chair, puffing at his cigar. I heard the creak of a door and the crisp sound of boots upon gravel. The steps passed along the path on the other side of the wall under which I crouched. Looking over, I saw the naturalist pause at the door of an out-house in the corner of the orchard. A key turned in a lock, and as he passed in there was a curious scuffling noise from within. He was only a minute or so inside, and then I heard the key turn once more and he passed me and reentered the house. I saw him rejoin his guest, and I crept quietly back to where my companions were waiting to tell them what I had seen.
“You say, Watson, that the lady is not there?” Holmes asked when I had finished my report.
“No.”
“Where can she be, then, since there is no light in any other room except the kitchen?”
“I cannot think where she is.”
I have said that over the great Grimpen Mire there hung a dense, white fog. It was drifting slowly in our direction and banked itself up like a wall on that side of us, low but thick and well defined. The moon shone on it, and it looked like a great shimmering ice-field, with the heads of the distant tors as rocks borne upon its surface. Holmes’s face was turned towards it, and he muttered impatiently as he watched its sluggish drift.