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 shadow which Harley had seen upon the blind? And with what purpose did Colonel Menendez leave the house at midnight?

Somnambulism might solve the second riddle, but to the first I could find no answer acceptable to my reason. And now, pursuing my aimless way, I presently came in sight of a gable of the Guest House. I could obtain a glimpse of the hut which had once been Colin Camber’s workroom. The window, through which Paul Harley had stared so intently, possessed sliding panes. These were closed, and a ray of sunlight, striking upon the glass, produced, because of an over-leaning branch which crossed the top of the window, an effect like that of a giant eye glittering evilly through the trees. I could see a constable moving about in the garden. Ever and anon the sun shone upon the buttons of his tunic.

By such steps my thoughts led me on to the pathetic figure of Ysola Camber. Save for the faithful Ah Tsong she was alone in that house to which tragedy had come unbidden, unforeseen. I doubted if she had a woman friend in all the countryside. Doubtless, I reflected, the old housekeeper, to whom she had referred, would return as speedily as possible, but pending the arrival of someone to whom she could confide all her sorrows, I found it almost impossible to contemplate the loneliness of the tragic little figure.

Such was my mental state, and my thoughts were all of compassion, when suddenly, like a lurid light, an inspiration came to me.

I had passed out from the shadow of the tower and was walking in the direction of the sentinel yews when this idea, dreadfully complete, leapt to my mind. I pulled up short, as though hindered by a palpable