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60 the door itself disappeared. Across the opening into the library stood a screen, and it was not until I had pushed this somewhat aside that I was able to look into that room.

My first glance assured me it was empty. Stark and bare of any occupant, the high-backed chairs loomed in the funereal gloom, while on the table, toward which I inadvertently glanced, stood a decanter with a solitary wineglass at its side. Instantly I remembered what had been told me concerning that glass, and stepping forward, I took it up and looked at it.

Immediately I heard, or thought I heard, an exclamation uttered somewhere near me. But upon glancing up and down the room and perceiving no one, I concluded I was mistaken, and deliberately proceeded to examine the wine-glass and assure myself that no wine had as yet been poured upon the powder I found in it. Satisfied at last that Mr. Benson had not yet taken his usual evening potion, I put the glass back and withdrew again to my retreat.

I do not think another minute could have elapsed, before I heard a step in the room behind me. A door leading into an adjoining apart-