"No! no!" she cried, covering her face with her hands. "Request no explanation, for, I--I cannot give it. It would be fatal." "But why?" I asked, for it was a cruel and bitter disappointment. All my hopes had been shattered in those brief moments. "From the day we first met I have known we loved one another," she said slowly, "yet it would have been better had we never become acquainted, since it causes pain to both." "But, surely, if you love me, Vera, this obstacle can be removed! Tell me what it is; if a secret, it will be safe with me," I said earnestly. She dashed the tears from her eyes, and with an effort stood erect before me, saying: "No! it is impossible. Think no more of marriage, Frank; regard me only as a dear friend who loves you." "Then you will not tell me why we cannot marry?" I said, gravely, rising and taking her hand. "It--it is a secret. I would rather die than divulge it; though, some day, perhaps, the circumstances will alter, and I shall be at liberty to tell you everything. For the present we love one another, but it must end there; marriage is entirely out of the question." I saw it was useless to press for any further explanation. Evidently she was prepared for any self-sacrifice, to protect her secret, because, when finding herself wavering, she had summoned all her strength, and with a mighty effort overcame her emotion, resolutely giving her answer. As we rose and turned towards the city, a circumstance, slight in itself, occurred, which afterwards caused me not a little perturbation and surprise, and which considerably enhanced the mystery surrounding the fair Russian. We were passing a buttress of the fort when my attention was arrested by what appeared to be a man standing bolt upright in the shadow. I was too engrossed with thoughts of our _tete-a-tete_ to allow the discovery of an eavesdropper--probably only a peasant--to cause me any alarm, but, seeing my eyes upon him, for I had halted to make sure, the figure suddenly drew from the shadow, and, with its face averted from the moonlight, walked rapidly away. Vera, uttering an exclamation of surprise or alarm,--which it was I could not tell--seized my arm with a convulsive energy that caused me no small pleasure at the feeling of dependence it implied, and drew a deep breath. "Do you know him?" I asked. "No, no; not at all," she quickly replied. "He might have heard us; but never mind." I endeavoured to learn the cause of her alarm thinking that so much agitation could not be created by such a trivial circumstance; but whether my knowledge of feminine nature was imperfect, or whether she knew who the listener was, and concealed his identity, I could not learn, her answers being of the most evasive kind. It was plain that the fact of our being discovered together had caused her the greatest consternation, and I was considerably puzzled to assign to this a reason.