That the moth-ball man had suddenly caught sight of the “doctor,” and that the meeting was totally unexpected and alarming to him, was another fact of which I was fairly sure. What had happened next? The “doctor” had removed his disguise and followed the woman to Marlow. But it was possible that had he removed it rather hastily traces of spirit gum might still linger on his chin. Hence my question to Mrs. James.

Whilst occupied with my thoughts I had arrived at the low old-fashioned door of the Mill House. Unlocking it with the key, I passed inside. The hall was low and dark, the place smelt forlorn and mildewy. In spite of myself, I shivered. Did the woman who had come here “smiling to herself” a few days ago feel no chill of premonition as she entered this house? I wondered. Did the smile fade from her lips, and did a nameless dread close round her heart? Or had she gone upstairs, smiling still, unconscious of the doom that was so soon to overtake her? My heart beat a little faster. Was the house really empty? Was doom waiting for me in it also? For the first time, I understood the meaning of the much-used word, “atmosphere.” There was an atmosphere in this house, an atmosphere of cruelty, of menace, of evil.