But the days, nay weeks, went on. September ended and October came with rain and chilly wind, and though I returned to Upton End, and frequently made inquiry over the telephone to Lydford, yet, though I wrote to Davis at the Poste Restante at Charing Cross, I could learn no news of them. They had descended those back stairs of the hotel at Aix, and disappeared as completely as though the earth had swallowed them up.

One day in the middle of October, with sudden resolve to carry out Nicholson’s injunction to investigate, I drove over to Lydford, and on arrival, about noon, found all smart and well-kept as though its owner were in residence.

I told a rather lame story to the housekeeper, who, knowing me, came to me in the long, chintz-covered drawing-room, the blinds of which were down. She had not heard from her master for a month past, the pleasant-faced woman explained. He was then in Aix. I said that I had left him there and returned to England, and was now anxious to discover where he was.

Then, after a brief chat, I exhibited my left forefinger enveloped in an old glove, and told her that on my way I had some engine-trouble and had hurt my finger.

“I believe Mr Shaw keeps up in his room a small medicine chest,” I said, for I recollected that he once told me that he kept one there. “I wonder if I might go up and try and find a piece of bandage.”

“Certainly,” replied Mrs Howard, and she led me upstairs to the apartment over the drawing-room, which I had come to Lydford for the purpose of examining. It was a large, airy, and well-furnished room, with a big book-case at one end and a canary in a cage at the window.

Without much difficulty she discovered the small black japanned box, containing various surgical drugs and bandages, and I at once sent her down to obtain a small bowl of warm water.

Then, the instant she had gone, I sought for the cupboard indicated by the dead man’s letter.

Yes, it was there, a long, narrow cupboard beside the fireplace, secured by two large locks of a complicated character such as one finds on safe or strongroom doors.

I bent and examined them thoroughly.