I turned my head and glanced over my shoulder, when, to my surprise, I saw a light glimmering through the window. What was its origin? The house was certainly uninhabited, even by the dead--for Mordaunt had informed me that a detail had, that morning, buried the corpse.

There was but one means of solving the mystery, and I leaped the fence, riding straight toward the house; soon reaching it, I dismounted and threw open the door.

What should greet my eyes, but the respectable figure of Mr. Nighthawk, seated before a cheerful blaze, and calmly smoking his pipe!

XXV.

THE APPOINTMENT.

As I entered, Mr. Nighthawk rose politely, without exhibiting the least mark of astonishment.

"Good evening, colonel," he said, smiling, "I am glad to see you."

"And I, never more surprised to see any one than you, here, Nighthawk!"

"Why so, colonel?"

I could not help laughing at his air of mild inquiry.

"Did I not leave you at our head-quarters?"

"That was two days ago, colonel."

"And this is your residence, perhaps?"

"I have no residence, colonel; but am here, temporarily, on a little matter of business."

"Ah! a matter of business!"

"I think it might be called so, colonel."

"Which it would be indiscreet to reveal to me, however. That is a pity, for I am terribly curious, my dear Nighthawk!"

Nighthawk looked at me benignly, with a philanthropic smile.

"I have not the least objection to informing you, colonel. You are a gentleman of discretion, and have another claim on my respect."

"What is that?"

"You are a friend of Colonel Mohun's."

"A very warm one."

"Then you can command me; and I will tell you at once that I am awaiting the advance of General Grant."

"Ah! Now I begin to understand."

"I was sure you would at the first word I uttered, colonel. General Grant will cross the Rapidan to-night--by to-morrow evening his whole force will probably be over--and I expect to procure some important information before I return to General Stuart. To you I am Mr.

Nighthawk, an humble friend of the cause, employed in secret business,--to General Grant I shall be an honest farmer, of Union opinions, who has suffered from the depredations of his troops, and goes to head-quarters for redress. You see they have already stripped me of every thing," continued Mr. Nighthawk, waving his arm and smiling; "not a cow, a hog, a mule, or a mouthful of food has been left me. They have destroyed the very furniture of my modest dwelling, and I am cast, a mere pauper, on the cold charities of the world!"

Mr. Nighthawk had ceased smiling, and looked grave; while it was I who burst into laughter. His eyes were raised toward heaven, with an expression of meek resignation; he spread out both hands with the eloquence of Mr. Pecksniff; and presented the appearance of a virtuous citizen accepting meekly the most trying misfortunes.

When I had ceased laughing, I said:--

"I congratulate you on your histrionic abilities, Nighthawk. They deserve to be crowned with success. But how did you discover this house?"

"I was acquainted with its former owner, Mrs. Parkins. She was a sister of a friend of mine, whom I think you have seen, colonel."

"What friend?"

"His name is Swartz, colonel."

"Not the Federal spy?"

"The same, colonel."

"Whom we saw last in the house between Carlisle and Gettysburg?"

"I saw him the other day," returned Mr. Nighthawk, smiling sweetly.

"Is it possible!"

"Near Culpeper Court-House, colonel. And, to let you into a little secret, I expect to see him to-night."

I looked at the speaker with bewilderment.

"That man will be here!"

"If he keeps his appointment, colonel."

"You have an appointment?"

"Yes, colonel."

"In this house?"

"To-night."

"With what object, in heaven's name!"

Nighthawk hesitated for some moments before replying.

"The fact is, colonel," he said, "that I inadvertently mentioned my appointment with Swartz without reflecting how singular it must appear to you, unless I gave you some explanation. But I am quite at my ease with you--you are a friend of Colonel Mohun's--and I will explain, as much of my business as propriety will permit. To be brief, I am anxious to procure a certain doc.u.ment in Swartz's possession."