Clenching his teeth and gripping his hands Jack regained control of himself, and returned to the instruments. "Thanks, Al," he sent. "I was about all in, sure enough. But I am OK again now, and going to stick it out unless 'they,' or 'it,' or whatever it is, lugs me off bodily."

"That's the talk," said Alex encouragingly. "I knew you'd make good. Just keep on telling yourself there must be some natural explanation somehow, and you'll win out OK."

"Yes, that's my cue--'a natural explanation somehow,'" Jack repeated to himself the following afternoon as he left the big railroad boarding-house, a half mile from the station, and set out for a walk, to think things over.

"And I believe the starting point is that talk on the wire. That certainly is the work of an operator.

"Now, why is it heard only at this office?

"Say! Could it be on the loop? A cut-off arrangement on the station loop?

"I'll go down and look into that right now," declared Jack, and turning about, headed for the station.

The platforms and the big freight shed were alive with the bustle of the freight handlers, loading and unloading cars, trundling boxes and bales from one part of the platform to another and in and out of the big shed; and unnoticed, Jack discovered where the wires from the pole pa.s.sed in under the roof. Entering the shed, he proceeded carefully to follow their course along the beams toward the telegraph room. He had almost reached the part.i.tion, and was beginning to think his conclusion perhaps too hastily drawn, when a few feet from the wall, where the light from an opposite window struck the roof, he caught two unmistakable gleams of copper. With a suppressed cry he made his way directly beneath, and at once saw that the insulation of both wires of the loop had been cut through.

"Right! I was right!" exclaimed Jack jubilantly beneath his breath. "And I can see in a minute how it's done. Whoever it is, simply gets up there somehow, and ticks one wire against the other--and of course the instruments inside click as they are alternately cut off and cut on, and the rest of the line is not affected!

"Good! I'm on the trail.

"But what can be the object of it all?"

Jack turned to look about him, and as in answer the lettering of a nearby box caught his eye:

"VALUABLE! HANDLE WITH CARE!"

"Freight stealing! Could that be it?"

On reporting for duty that evening Jack called Alex on the wire and asked if any freight had recently been reported missing from the Midway depot.

"No, but I understand some valuable stuff has been mysteriously disappearing at Claxton and Eastfield," was the reply.

Jack was considerably disappointed; but before giving up this line of investigation he determined to study the freight records of the station, to discover whether any freight for the two places mentioned by Alex had pa.s.sed through Midway. A few minutes' search produced the record of a valuable shipment of silk to Claxton. A moment later he found another.

When presently he found still others, and several to Eastfield, he hurried back to the wire and calling Alex asked the nature of the goods lost track of at those stations, and breathlessly awaited the reply.

"I'll ask," said Alex--"Silverware and silk. Mostly silk."

Jack uttered a shout. "Hurrah, Alex," he whirred, "I'm on the track of our friend the 'ghost.' But keep mum.

"And now the question is," he told himself, leaning back in his chair, "how do they work it?"

The answer to the query came very unexpectedly as Jack left the station office at daybreak. Strolling down the front platform, where several men already were at work unloading a car, he inadvertently got in the way of a loaded truck. On the sudden cry of the truckman he sprang aside, tripped, and fell headlong against a large, square packing-case. As he did so, he distinctly heard from within a sharp "Oh!"

Only with difficulty did Jack avoid crying out, and scrambling to his feet, hastened away, that his discovery might not be suspected by the man in the box.

The whole mystery was now clear. The "ghost" was a freight thief, who had himself shipped, in a box, to some point which would necessitate his being transferred and held over night at the freight junction. He played "ghost" either to frighten the operator away, or to lead to the belief that any noises overheard were caused by "spirits," then overhauled the valuable freight in the shed, took what he wanted with him into his own box (which supposedly he could open and close from the inside), and was shipped away with it the following morning. The rifled packages, carefully re-sealed, also went on to their several destinations, and the blame of the theft was laid elsewhere.

Jack was not long in deciding upon his next move. Coming down from the boarding-house before the sheds had been closed that afternoon, he noted where the box containing the unsuspected human freight had been placed, and selecting a window at the far end of the shed, seized a favorable moment to quietly loosen its catch.

It was near midnight, and Jack was once more the sole guardian of the station when he took the next step. And despite a certain nervousness, now that the exciting moment was at hand, he found considerable amus.e.m.e.nt in carrying it out.

It was nothing less than making up a dummy imitation of himself asleep on a cot in a corner of the telegraph room--as a precaution against the "ghost" peering within to learn the effect of his "haunting."

In making the dummy Jack used a brown fur cap for the head, a glimpse of which under an old hat looked remarkably like his own brown head. A collection of old overalls and record books carefully arranged formed the body, and his own shoes the feet.

When over the whole he threw his overcoat, the deception was complete.

Chuckling at the subterfuge, Jack lost no time in slipping forth for the next step in his program.

Tiptoeing down the platform to the window whose latch he had loosened, he softly raised it, listened, and climbing through, dropped noiselessly to the floor. Feeling his way in the darkness amid the bales and boxes, he reached a nook behind a piano-case he had previously noted, and settling down, prepared to await the appearance of the "spectre."

The wait was not long. Scarcely had he made himself comfortable when from the direction of the big packing-case came the m.u.f.fled sound of a screw-driver. Soon there followed a noise as of a board being softly shoved aside, then a step on the floor. Simultaneously there was the crackle of a match, and peering forth Jack momentarily made out a thin, clean-shaven face bending over a dark-lantern. But quickly he drew back with a start of fright as the man turned and came directly toward him.

A few feet away, however, the intruder halted, and again peering cautiously forth Jack discovered the lantern, closely m.u.f.fled, on the floor, and beside it the dim figure of the man working with his hands at a plank. As Jack watched, wondering, the plank came up. Laying it aside carefully, the stranger stepped down into the opening, recovered the lantern, and disappeared.

"Now what under the sun is he up to?" exclaimed Jack to himself.

From the platform outside came the sound of footsteps. Jack started, listened a moment, and uttered a low cry of triumph. At last he understood.

"Well, what a dolt I am," he laughed. "Why didn't I think of that?

"The fellow is simply out beneath the platform, making sounds against the under side of the planking--probably with a stick!"

[Ill.u.s.tration: JACK MADE OUT A THIN, CLEAN-SHAVEN FACE BENDING OVER A DARK-LANTERN.]

Jack was still chuckling delightedly over this simple explanation of the mysterious "walking" when the noise ceased, and the light of the lantern returned.

On reappearing, the unknown dragged after him a long pole. As Jack watched, puzzling over its use, the "spectre" hoisted the pole to his shoulder, cautiously picked his way amid the freight to the telegraph-room part.i.tion, and mounted a large box.

And then, while Jack fairly shook with internal laughter, he laboriously raised the pole, and began b.u.mping and sc.r.a.ping it up and down the under side of the roof.

"Natural explanations!" bubbled Jack through his handkerchief. "And imagine anyone being frightened at it--beating it for home!"

When the man on the box had concluded his second "demonstration," and descended, Jack had cause to thank himself for his precaution in leaving the dummy. Evidently puzzled at the silence in the operating-room, the man placed his eye to the knot-hole in the part.i.tion, and peered through.

Muttering something in surprise, he listened closely, and looked again, while Jack looked on, shaking, and holding his mouth. Apparently at last satisfied that the "operator" within was asleep at his post, the intruder turned about and threw a shaft of light up toward the wires of the loop.

Expectantly Jack waited. Had he also guessed right here?

But to his disappointment, after a brief debate with himself, the "ghost"

muttered, "If he's asleep, what's the use?" And catching up the pole, he returned it to the hole in the floor, and replaced the plank.

Then, in final confirmation of Jack's deductions, the intruder turned his attention to the packages of merchandise about him, speedily selected a box, and proceeded to open it.

For several hours the unsuspecting freight robber worked, frequently returning to the crack in the part.i.tion to a.s.sure himself that the negligent "operator" there was still in the land of dreams, each time to Jack's great amus.e.m.e.nt. And finally, having secured all the booty he could handle, and having carefully closed the cases from which it had been taken, he moved the plunder into his own box, crept in after; again came the squeak of the screw-driver--and the robbery was complete.

At once Jack crept from his place of concealment, and back to the window; dropped out, and was off on the run for the boarding-house. And twenty minutes after he returned with the freight-house foreman and several freight hands, armed, and with lanterns.

Entering by the door, he led them directly to the robber's box.