"Hm! Odd thing that, Leary! Why didn't you challenge at first?"
"Sure, sor, he lept inside the fince quick as iver we set eyes on each other. He was bendin' down, and I thought it was one of the hound pups when I first sighted him."
"And he hasn't been around since?"
"No, sor, nor nobody, till the officer of the day came along."
Chester walked away puzzled. Sibley was a most quiet and orderly garrison. Night prowlers had never been heard from, especially over here at the south and southwest fronts. The enlisted men going to or from town passed across the big, high bridge or went at once to their own quarters on the east and north. This southwestern terrace behind the bachelors' row was the most secluded spot on the whole post—so much so that when a fire broke out there among the fuel-heaps one sharp winter's night a year agone it had wellnigh enveloped the whole line before its existence was discovered. Indeed, not until after this occurrence was a sentry posted on that front at all; and, once ordered there, he had so little to do and was so comparatively sure to be undisturbed that the old soldiers eagerly sought the post in preference to any other, and were given it as a peace privilege. For months, relief after relief tramped around the fort and found the terrace post as humdrum and silent as an empty church; but this night "Number Five" leaped suddenly into notoriety.
Instead of going home, Chester kept on across the plateau and took a long walk on the northern side of the reservation, where the quarter-master's stables and corrals were placed. He was affected by a strange unrest. His talk with Rollins had roused the memories of years long gone by—of days when he, too, was young and full of hope and faith, ay, full of love—all lavished on one fair girl who knew it well, but gently, almost entreatingly, repelled him. Her heart was wrapped up in another, the Adonis of his day in the gay old seaboard garrison. She was a soldier's child, barrack-born, simply taught, knowing little of the vice and temptations, the follies and the frauds, of the whirling life of civilization. A good and gentle mother had reared her and been called hence. Her father, an officer whose sabre-arm was left at Molino del Rey, and whose heart was crushed when the loving wife was taken from him, turned to the child who so resembled her, and centred there all his remaining love and life. He welcomed Chester to his home, and tacitly favored his suit, but in his blindness never saw how a few moonlit strolls on the old moss-grown parapet, a few evening dances in the casemates with handsome, wooing, winning Will Forrester, had done their work. She gave him all the wild, enthusiastic, worshipping love of her girlish heart just about the time Captain and Mrs. Maynard came back from leave, and then he grew cold and negligent there, but lived at Maynard's fireside; and one day there came a sensation—a tragedy—and Mrs. Maynard went away, and died abroad, and a shocked and broken-hearted girl hid her face from all and pined at home, and Mr. Forrester's resignation was sent from—no one knew just where, and no one would have cared to know, except Maynard. He would have followed him, pistol in hand, but Forrester gave him no chance. Years afterwards Chester again sought her and offered her his love and his name. It was useless, she told him, sadly. She lived only for her father now, and would never leave him till he died, and then—she prayed she might go too. Memories like this will come up at such times in these same "still watches of the night." Chester was in a moody frame of mind when about half an hour later he came back past the guard-house. The sergeant was standing near the lighted entrance, and the captain called him:
"There's a ladder lying back of the colonel's quarters on the roadway. Some of those painters left it, I suppose. It's a wonder some of the reliefs have not broken their necks over it going around to-night. Let the next one pick it up and move it out of the way. Hasn't it been reported?"
"Not to me, sir. Corporal Schreiber has command of this relief, and he has said nothing about it. Here he is, sir."
"Didn't you see it or stumble over it when posting your relief, corporal?" asked Chester.
"No indeed, sir. I—I think the captain must have been mistaken in thinking it a ladder. We would surely have struck it if it had been."
"No mistake at all, corporal. I lifted it. It is a long, heavy ladder—over twenty feet, I should say."
"There is such a ladder back there, captain," said the sergeant, "but it always hangs on the fence just behind the young officers' quarters—Bachelors' Row, sir, I mean."
"And that ladder was there an hour ago when I went my rounds," said the corporal, earnestly. "I had my hurricane-lamp, sir, and saw it on the fence plainly. And there was nothing behind the colonel's at that hour."
Chester turned away, thoughtful and silent. Without a word he walked straight into the quadrangle, past the low line of stone buildings, the offices of the adjutant and quartermaster, the home of the sergeant-major, the club and billiard-room, past the long, piazza-shaded row of bachelor quarters, and came upon the plank walk at the corner of the colonel's fence. Ten more steps, and he stood stock-still at the head of the flight of wooden stairs.
There, dimly visible against the southern sky, its base on the plank walk below him, its top resting upon the eaves midway between the dormer-window and the roof of the piazza, so that one could step easily from it into the one or on to the other, was the very ladder that half an hour before was lying on the ground behind the house.
His heart stood still. He seemed powerless to move—even to think. Then a slight noise roused him, and with every nerve tingling he crouched ready for a spring. With quick, agile movements, noiseless as a cat, sinuous and stealthy as a serpent, the dark figure of a man issued from Alice Renwick's chamber window and came gliding down.
One second more, and, almost as noiselessly, he reached the ground, then quickly raised and turned the ladder, stepped with it to the edge of the roadway, and peered around the angle as though to see that no sentry was in sight, then vanished with his burden around the corner. Another second, and down the steps went Chester, three at a bound, tip-toeing it in pursuit. Ten seconds brought him close to the culprit—a tall, slender shadow.
"You villain! Halt!"
Down went the ladder on the dusty road. The hand that Chester had clinched upon the broad shoulder was hurled aside. There was a sudden whirl, a lightning blow that took the captain full in the chest and staggered him back upon the treacherous and entangling rungs, and, ere he could recover himself, the noiseless stranger had fairly whizzed into space and vanished in the darkness up the road. Chester sprang in pursuit. He heard the startled challenge of the sentry, and then Leary's excited "Halt, I say! Halt!" and then he shouted—
"Fire on him, Leary! Bring him down!"
Bang went the ready rifle with sharp, sullen roar that woke the echoes across the valley. Bang again, as Leary sent a second shot after the first. Then, as the captain came panting to the spot, they followed up the road. No sign of the runner. Attracted by the shots, the sergeant of the guard and one or two men, lantern-bearing, came running to the scene. Excitedly they searched up and down the road in mingled hope and dread of finding the body of the marauder, or some clue or trace. Nothing! Whoever he was, the fleet runner had vanished and made good his escape.
"Who could it have been, sir?" asked the sergeant of the officer of the day. "Surely none of the men ever come round this way."
"I don't know, sergeant; I don't know. Just take your lamp and see if there is anything visible down there among the rocks. He may have been hit and leaped the wall.—Do you think you hit him, Leary?"
"I can't say, sor. He came by me like a flash. I had just a second's look at him, and—Sure I niver saw such runnin'."
"Could you see his face?" asked Chester,
