As he uttered these words, the man drew a revolver and aimed at Mohun’s breast.

Before he could fire, however, an explosion was heard, and I saw the man suddenly drop his weapon, which went off as it escaped from his nerveless grasp. Then he threw up his hands, reeled, took two uncertain steps backward, and fell at full length on the floor. Nighthawk had shot him through the heart.

All this had taken place in far less time than it has taken to write it. I had made violent efforts to break through the window; and finding this impossible, now ran to the door and burst into the apartment.

The singular scene was to have as singular a denouement.

Darke evidently realized the great danger which he ran, for the house was now surrounded, nearly, and his capture was imminent.

From the black eyes shot a glare of defiance, and advancing upon Mohun, he delivered a blow at him which nearly shattered his opponent’s sword. Mohun struck in turn, aiming a furious cut at Darke; but as he did so, he stumbled over the dead orderly, and nearly fell. For the moment he was at Darke’s mercy.

I rushed forward, sword in hand, to ward off the mortal stroke which I was certain his adversary would deliver, but my intervention was useless.

Darke recoiled from his stumbling adversary, instead of striking at him. I could scarcely believe my own eyes, but the fact was unmistakable.

Then the Federal colonel looked around, and his eye fell upon the woman.

“Kill him!” she said, coldly. “Do not mind me!—only kill him!”