"So affected was I by her intense conviction, and such confidence had I in my sister's wisdom, that I did not oppose her, but told the man to drive as she directed. The carriage fairly flew across the bridge, down the Boulevard St. Germain, then to the left, threading its way through the narrow streets that lie along the Seine. This way and that, straight ahead here, a turn there, she directing our course, never hesitating, as if drawn by some unseen power, and always urging the driver on to greater speed. Finally, we came to a black-mouthed, evil-looking alley, so narrow and roughly paved that the carriage could scarcely advance.
"'Come on!' my sister cried, springing to the ground; 'we will go on foot, we are nearly there. Thank God, we may yet be in time.'
"No one was in sight as we hurried along the dark alley, and scarcely a light was visible, but presently a smothered scream broke the silence, and, touching my arm, my sister exclaimed:—
"'There, draw your weapon, quick, and take the man at any cost!'
"So swiftly did everything happen after that that I hardly know my actions, but a few minutes later I held pinioned in my arms a man whose blows and writhings had been all in vain; for you must know that much exercise in the jungle had made me strong of limb. As soon as I had made the fellow fast I looked down and found moaning on the ground a poor woman, who explained with tears and broken words that the man had been in the very act of strangling her. Searching him I found a long-bladed knife of curious shape, and keen as a razor, which had been brought for what horrible purpose you may perhaps divine.
"Imagine my surprise, on dragging the man back to the carriage, to find, instead of the ruffianly assassin I expected, a gentleman as far as could be judged from face and manner. Fine eyes, white hands, careful speech, all the signs of refinement and the dress of a man of means.
"'How can this be?' I said to my sister in our own tongue as we drove away, I holding my prisoner on the opposite seat where he sat silent.
"'It is a kulos-man,' she said, shivering, 'it is a fiend-soul. There are a few such in the whole world, perhaps two or three in all.'
"'But he has a good face.'
"'You have not seen his real face yet; I will show it to you, presently.'