Unlocking the door, I stepped, as I had been told I should, into a small room adjoining the library. All around me were books. Even the door by which I had entered was laden with them, so that when it was closed, all vestige of 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 wineglass 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 apartment had opened and Mr. Benson had come in. He passed immediately to the table, poured out the wine upon the powder, and drank it off without a moment's hesitation. I heard him sigh as he put the glass down. With a turn of my hand I slipped off both domino and mask, and prepared to announce my presence by tapping on the lintel of the door beside which I stood. But a sudden change in Mr. Benson's lofty figure startled me. He was swaying, and the arms which had fallen to his side were moving with a convulsive action that greatly alarmed me. But almost instantly he recovered himself, and paced with a steady step toward the hall door, which at that moment resounded with a short loud knock. "Who is there?" he asked, with every appearance of his usual sternness. "Hartley," was the reply. "Are you alone?" the old gentleman again queried, making a move as if to unlock the door. "Carrie is with me; no one else," came in smothered accents from without. Mr. Benson at once turned the key, but no sooner had he done so than he staggered back. For an instant or two of horror he stood oscillating from side to side, then his frame succumbed, and the terrified eyes of his children beheld his white head lying low, all movement and appearance of life gone from the form that but a moment before towered so proudly before them. With a shriek, the daughter flung herself down at his side, and even the cheek of Hartley Benson grew white as he leaned over his father's already inanimate body. "He is dead!" came in a wild cry from her lips. "See! he does not breathe. Oh! Hartley, what could have happened? Do you think that Joe--"