"Listen." She was speaking rapidly, nervously. "If I help you to take Dr. Fu-Manchu--tell you where he is to be found ALONE--will you promise me, solemnly promise me, that you will immediately go to the place where I shall guide you and release my brother; that you will let us both go free?" "I will," I said, without hesitation. "You may rest assured of it." "But there is a condition," she added. "What is it?" "When I have told you where to capture him you must release me." I hesitated. Smith often had accused me of weakness where this girl was concerned. What now was my plain duty? That she would utterly decline to speak under any circumstances unless it suited her to do so I felt assured. If she spoke the truth, in her proposed bargain there was no personal element; her conduct I now viewed in a new light. Humanity, I thought, dictated that I accept her proposal; policy also. "I agree," I said, and looked into her eyes, which were aflame now with emotion, an excitement perhaps of anticipation, perhaps of fear. She laid her hands upon my shoulders. "You will be careful?" she said pleadingly. "For your sake," I replied, "I shall." "Not for my sake." "Then for your brother's." "No." Her voice had sunk to a whisper. "For your own." CHAPTER XVII A COOL breeze met us, blowing from the lower reaches of the Thames. Far behind us twinkled the dim lights of Low's Cottages, the last regular habitations abutting upon the marshes. Between us and the cottages stretched half-a-mile of lush land through which at this season there were, however, numerous dry paths. Before us the flats again, a dull, monotonous expanse beneath the moon, with the promise of the cool breeze that the river flowed round the bend ahead. It was very quiet. Only the sound of our footsteps, as Nayland Smith and I tramped steadily towards our goal, broke the stillness of that lonely place. Not once but many times, within the last twenty minutes, I had thought that we were ill-advised to adventure alone upon the capture of the formidable Chinese doctor; but we were following out our compact with Karamaneh; and one of her stipulations had been that the police must not be acquainted with her share in the matter. A light came into view far ahead of us. "That's the light, Petrie," said Smith. "If we keep that straight before us, according to our information we shall strike the hulk." I grasped the revolver in my pocket, and the presence of the little weapon was curiously reassuring. I have endeavored, perhaps in extenuation of my own fears, to explain how about Dr. Fu-Manchu there rested an atmosphere of horror, peculiar, unique. He was not as other men. The dread that he inspired in all with whom he came in contact, the terrors which he controlled and hurled at whomsoever cumbered his path, rendered him an object supremely sinister. I despair of conveying to those who may read this account any but the coldest conception of the man's evil power.