Presently Lardy Bill tossed away the end of his cigarette, and crossing to his prisoner, examined his bonds and satisfied himself that they were still intact. On going back to the box he was rejoined by Slinkey, who now proceeded to go down on one knee and rest his ear on the rail. "She's coming; I can hear her quite plain," he said after a few moments. "Another five minutes and she ought to be here."

"Then I'll hurry off to the others," said Lardy. "I shall be wanted there when the shindy comes off, and you'll manage here by yourself all right."

"Right you are," responded the other. "As soon as ever the train's past, I shall cut the wires, and then make a bolt of it, and wait for you fellows at the cottage."

Nothing more was said. Lardy Bill started at a quick pace down the branch, while Slinkey re-entered the box.

Neither of them had the slightest suspicion that for the last ten minutes or more all their actions had been watched by an unseen witness; but such was the case. When Clara Brooke, to her intense dismay, discovered that not her husband, but a stranger, was the occupant of the box, she felt for a little while as if her heart must die within her. Then she became aware of two dusky figures standing a little distance away, whom she rightly concluded to be other members of the gang; but still her husband was nowhere to be seen. She had arrived on the spot almost immediately after Gerald had been bound to the tree; but the night was too dark to admit of her seeing him from that distance. She felt at once that she must get round to where the signal-box stood, on the opposite side of the line, and, if it were possible, approach near enough to the men to overhear their conversation, and by that means discover what had become of her husband. No sooner was the thought formulated in her mind than she began to put it into practice. Still keeping in the shelter of the hedge that ran parallel with the line, she sped as fast as her feet could carry her to a point some forty or fifty yards farther down the line, far enough, as she judged, to be out of the range of vision of any one who might be on the lookout at the box. Here, after drawing her shawl over her head--she had discarded her bonnet some time before--she broke through the hedge, was across the line in three seconds; and then, after pushing through the hedge on the opposite side, she turned back in the direction of the signal-box, she and it being both now on the same side of the line. Creeping forward foot by foot and yard by yard, she presently found herself a little way behind the box, and within a dozen yards of her husband, had she only been aware of it.

While this was happening, one of the men had gone off to join the others down the line. Clara, peering through the interstices of the hedge, could see the two remaining men walking and talking together, but was too far away to distinguish what they said. Not long had she watched and waited when she heard the ting-ting of the telegraph bell. She knew that it was a signal of some kind, but not what its precise meaning might be. Then one of the men disappeared into the box, while the other--it was the one, she could now make out, who was dressed like a clergyman--turned, and seemed as if he were marching directly towards her. Terror-stricken, she dropped completely out of sight behind the hedge-bank, expecting every moment to feel a hand laid on her shoulder. But nothing coming, she breathed again; then her head went up till her eyes were on a level with the top of the bank; then, to her surprise, she saw that the man seemed to be carefully examining the trunk of a tree some little distance away. She strained her eyes in the endeavour to see what he could possibly be about, and then suddenly her heart gave a great bound. The trunk of the tree was defined like a faint silhouette against a background of starlit April sky, but it was a silhouette which in one portion of its outline bore a startling resemblance to a human figure. As by a flash of divination, Clara knew that it was her husband she was gazing upon. Her breath fluttered on her lips like a bird trying to escape, and she set her teeth hard in the flesh of her arm, to stifle the cry that broke involuntarily from her heart.

After a few seconds the man went back; and after saying a few words to his confederate, he apparently took leave of him, and starting down the branch, was quickly lost to view; then the other at once went back into the box. Now was Clara's opportunity.

Half a minute later she was by her husband's side. Laying a hand softly on his arm, she said in a low voice: "Gerald it is I--Clara." Some smothered sounds came back to her; and then she discovered, what the darkness had hitherto hidden, that her husband's head and face were closely muffled. Her trembling but skilful fingers quickly undid the knots and removed the covering. Gerald gave a great gasp of relief as he drew a deep inspiration of the cool night-air. Then he whispered: "You will find a knife in my outside pocket." In a minute from that time he was a free man.

Slinkey, waiting alone in the signal-box, had tried the lever again and again by means of which the points were opened that would turn the train on to the branch, and had satisfied himself that everything was in working order. Both the distance and the home signal-lamps showed the white light, so that the train would speed on unsuspectingly with unslackened pace. Slinkey at the best of times was a nervous timid creature--a man who walked ever in trembling dread of the hand which he knew would some day be laid suddenly on his shoulder--but now that he was left alone, now that he had no longer Lardy Bill's audacious bulldog courage to help to animate his own, his craven heart sank lower and lower, and he would have given a year of his life to be well out of the adventure into which he had allowed himself to be seduced.

The low deep hum of the oncoming train grew palpably on the ear. Instinctively, Slinkey's hand closed on lever No. 3, while his heart began to beat a sort of devil's tattoo after a fashion that was far from comfortable. Suddenly he gave a great start, and for a moment or more the tattoo came to a dead stop. He had heard a sound that he remembered full well: it was the noise caused by the explosion of a fog-signal. At the same instant the engine began to whistle its shrillest. Then came the explosion of a second signal, and then the whistle ceased as suddenly as it began. And now he could faintly hear the soft rhythmical pulsing of the engine, as it might be that of some antediluvian monster which had been racing till it was scant of breath; and Slinkey knew that the train had slackened speed and was feeling its way forward slowly and cautiously. What could be the matter? What could have happened? By whom and with what intent had fog-signals been placed on the line on a night so clear and beautiful?