A glance at the woman revealed no change in her appearance. Before me was the same lithe and graceful figure, clad as before in a gray dress. I saw the same snow-white cheeks, red lips, and large eyes burning with a latent fire. The two were busily engaged, and it was not difficult to understand their occupation. The desks, drawers and chests of the apartment were all open; and the female with rapid hands was transferring papers from them to Swartz, who methodically packed them in a leathern valise. These papers were no doubt important, and the aim to remove them to some place of safety beyond the reach of the Confederates. I gazed for some moments, without moving, upon the spectacle of these two night-birds at their work. The countenance of the lady was animated; her motions rapid; and from time to time she stopped to listen. Swartz, on the contrary, was the incarnation of phlegmatic coolness. His face wore an expression of entire equanimity; and he seemed to indulge no fears whatever of intruders. All at once, however, I saw his eyes glitter as they fell upon a paper which she handed him to pack away with the rest. It was carefully folded, but one of the folds flew open as he received it, and his eyes were suddenly fixed intently upon the sheet. Then his head turned quickly, and he looked at his companion. She was bending over a drawer, and did not observe that glance. Thereupon Swartz folded up the paper, quietly put it in his pocket, and went on packing the valise with his former coolness; only a slight color in his face seemed to indicate concealed emotion. As he pocketed the paper, his companion turned round. It was plain that she had not perceived the manoeuvre. At the same moment I heard the sound of hoofs in rear of the house, and the clatter of a sabre as a cavalier dismounted. A few indistinct words, apparently addressed to a servant or orderly, followed. Then the door of the apartment opposite the front window was thrown open, and a man entered. In the new-comer I recognized Mohun’s adversary at Upperville--Colonel Darke, of the United States Cavalry. XXI. FALLEN. Darke entered the apartment abruptly, but his appearance seemed to occasion no surprise. The spy retained his coolness. The lady went on with her work. You would have said that they had expected the officer, and recognized his step. Their greeting was brief. Darke nodded in apparent approbation of the task in which the man and woman were engaged, and folding his arms in front of the marble mantel, looked on in silence. I gazed at him with interest, and more carefully than I had been able to do during the fight at Upperville, when the smoke soon concealed him. Let me draw his outline. Of all the human beings whom I encountered in the war, this one’s character and career were perhaps the most remarkable. Were I writing a romance, I should be tempted to call him the real hero of this volume.