The work on the chimney had been perforce interrupted for several days, much to Beresford's benefit. The less prolonged exposure to the noxious atmosphere of the inner cave, and the new hope engendered in his heart by the knowledge that something was in progress above, effected a decided improvement in his physical and mental condition. His fear now was that he would be summoned again to the Old Man, and condemned without reprieve, before the chimney was complete. He resolved, if he were sent for, to persist in his refusal to translate the tablet, in the hope that the Old Man would spare him for yet further coercion.

Forrester set to work on the ladder as soon as possible after the knife came to hand. At night, in the pa.s.sage, he cut short lengths of bamboo as rungs, and knotted them firmly to the two uprights with the cord. It was a crazy structure at the best, and he had a nervous dread lest, if he fell, he should break through or displace the slab over the pit, and be turned instantly to dust. But an experimental ascent against the wall and the cavern somewhat rea.s.sured him as to the ladder's stability, and setting its top in the cavity above the pit, he mounted and resumed the work of scouring away the dust overhead.

From that moment they applied themselves to the task with unremitting energy. As soon as their fellow prisoners were torpid in the heavy sleep that was the only alleviation of their lot, the Englishmen stole from their place, and laboured until their endurance gave out. Forrester spared Beresford as much as possible, and often undertook the double work, alternately lifting the slab to release the rays, and, when it was lowered, climbing to remove the dust. Each knew he carried his life in his hands, for the ladder could not be entirely hidden. If any priest should chance to visit by day the pa.s.sage in which they laid it, he could not fail to observe it, and then their fate was sealed. But, judging by past experience, that risk was slight; and to disregard it was the only way to success.

Every now and then Forrester reported progress to his friends above.

The length of the chimney increased about eighteen inches a day on the average; if, as they had calculated, there remained--before they constructed the ladder--twenty feet of rock to pierce, in a fortnight they should arrive at or very near the surface. Meanwhile they received no news of what was happening above ground. Mackenzie did not reveal his plans; perhaps, they thought, he had formed none, but was biding his time until the chimney was nearly completed. His messages were brief words of encouragement, a.s.surances that all was well, and the news that he was in touch daily with Jackson, Sher Jang, and Hamid Gul.

Rather more than a week after the first use of the ladder, Forrester made the alarming discovery that he could no longer reach the top of the cavity with the outstretched pole. This threatened the stoppage of the work, for neither pole nor ladder could be lengthened. He did not mention the matter to Beresford, who by this time had ceased to work on the chimney. When he had trans.m.u.ted the due number of plates, he was too much fatigued to endure the strain any longer, and Forrester persuaded him that he must conserve his strength for what might ensue when the chimney was completely pierced. Anything that might throw him back was to be avoided.

Forrester puzzled over the baffling problem that now confronted him.

Time and again he stood looking up into the cavity, trying to conceive of a means by which the top might be reached. It was two days before he hit upon a possible solution. If he could cut notches in the walls of the chimney, and insert in them cross-bars of bamboo, he would be able to raise himself successively to heights from which the rock above would be within reach of the pole. To obtain material for the cross-bars he would have to shorten the pole; the difficulty was the notches: how could they be cut with no tool but a knife? Standing on the ladder, he tried the point of the blade on the rock, and found that this, while not very hard, was not friable enough to be excavated by so pliant a tool.

His thoughts turned at once to Mackenzie: perhaps he could find a more serviceable instrument. That night he placed in the bone the following note: "Work stopped: send a chisel." Next night he found in the bottom of the cleft, not a chisel, but a bar of iron slightly pointed at one end. Accompanying it was a note: "Hope this will serve. Let me know when near surface."

This implement he found to answer his purpose sufficiently well. From his perch on the top rung of the ladder he worked out two holes in the rock on opposite sides of the chimney; then with the knife he cut the proper length of bamboo, and thus fashioned a cross-bar on which he could stand to repeat the same operation higher up. In this way he made a series of steps enabling him to brush the dust, as before, from the top of the cavity after each employment of the rays. Only then did he acquaint Beresford with the difficulty and the manner in which it had been overcome.

The progress of the work was necessarily slower now. The cross-bars had to be removed after each ascent; otherwise at the next opening of the pit they would have been instantly destroyed. But the piercing went on steadily, and Forrester felt sure that, unless his calculations were very much out, his pole would in a few more days penetrate the roof of the chimney, and emerge through a hole in the floor of whatever room was immediately above him.

"Be very cautious," Beresford urged, when he learnt this good news. "To break through prematurely might be fatal to us all. Tell Mackenzie how things are, and ask for instructions."

"Yes. We shall have done our part. The rest will lie with him. I wonder what old Mac has been doing all this time?"

CHAPTER XVI

THE HOLE IN THE WALL

Mackenzie, meanwhile, had been playing a very busy and at the same time a very discreet part above ground, with timorous but efficient a.s.sistance from Hamid Gul. It was the latter who, at night, when all was quiet, stole from the kitchen into the pa.s.sage, and tied the string to a bar of the golden grating, so cleverly that only the closest scrutiny could have detected it. Having ascertained by means of this device the whereabouts of Forrester, and the burrowing in which he and Beresford were engaged, Mackenzie, in his calm sagacious way, set himself to think out a plan for turning that work to account.

At first he decided to employ Hamid Gul only as postman. It was of vital importance that the Old Man should entertain no suspicion of his cook. There seemed little risk of Hamid's night-work at the grating being detected. An Indian servant moves more silently than a cat. On the other hand, if he pried and prowled in the paG.o.da or its precincts, for the purpose of discovering the means of access to the rift, or the other particulars about which Mackenzie was curious, he would almost certainly attract the notice of the Chinese, and ruin everything. For the same reason Mackenzie took care that his necessary meetings with Hamid should take place at different times of the day, at different spots, and in the utmost secrecy.

His own actions were dictated by shrewd policy. To begin with, he told Jackson no more, not that he distrusted him, but that he feared the possibility of his disclosing something if for any reason the priests should again practise their hypnotic powers on him. Then, he a.s.sumed in public the mien of a slave, utterly cowed, bereft of will power, who lived only to get through his appointed task, and had no other aim than to merit his masters' approval. So well did he act his part that after a few days' observation, the priests concluded that their taming process had been thoroughly effective, and paid no more attention to him than to any other of the men who toiled and sighed on the plateau. That the dejection which Mackenzie feigned was in Jackson's case real confirmed them in their delusion. Sher Jang, meanwhile, went about his tasks with philosophic submissiveness; but in his heart of hearts he believed that the sahibs, whose movements he watched un.o.btrusively, would some day get the better of the Chinese dogs, and he was ready instantly to obey the call which he felt would surely come.

When Mackenzie was satisfied that he was accounted well broken in, he took to roaming at night about the precincts of the paG.o.da. He had already settled in his mind that the way to the rift could lie only through the paG.o.da or one of the neighbouring buildings, and his chief aim must be to discover that. It was also of vital importance to find as nearly as possible the spot where the chimney would cut through the earth; one step towards that discovery was the knowledge that its base was fifty yards from the cleft, and therefore presumably from the grating in the pa.s.sage. He had been much puzzled by the almost incessant knocking that proceeded in day-time from the low building behind the orchard, but dismissed that matter as of no account so far as he and his friends were concerned.

The wall enclosing the paG.o.da and its appurtenances was twelve feet in height: too high to look over, too smooth to scale. The gate by which Hamid issued to the fields was unlocked for him by a priest, and locked after him. Mackenzie meant to get inside the wall. It would not be difficult, perhaps, to make a ladder, but before taking this in hand he might as well see if there was a less ostentatious mode of entry.

Strolling at the rear of the orchard late one dark night, he was guided by the sound of running water to the stream which he and Forrester had observed on their first day upon the plateau. He followed the course of this, and discovered that it entered the enclosure on the north side by a culvert beneath the wall. The darkness rendered it impossible to measure with the eye the width and depth of the arch, but on stooping and feeling along the stonework, he found that the stream poured through an iron grating. Since the water was perfectly clear, the grating must have been designed, not as a strainer, but as a defence against intrusion. The Old Man was obviously a stickler for privacy.

Mackenzie pushed and shook the grating, to ascertain whether it was firmly fixed. It held fast, but slipping his hand under the water, he discovered that the submerged part was worn thin with long corrosion, and that there were several gaps in it where the iron had been completely rusted away. With a little exertion he managed to break off a considerable portion of the grating below water, leaving a s.p.a.ce large enough for a man to crawl through. It had occurred to him at once that this was a safer means of getting inside than by a ladder, which would always make him a conspicuous object to anyone who chanced to be looking that way from the buildings.

There was no time like the present. Without removing his clothes, Mackenzie slipped into the stream, spread himself flat, and, taking a long breath, wriggled under water through the arch. When he stood up, he found that the top of the grating was considerably higher than his head, but that his head was higher than the earthen embankments of the stream on either side. The depth of the water was no more than three feet; but the embankments were no doubt intended to protect the buildings from flood in those seasons when the stream, swollen by the melting snow on the mountains, became a torrent.

Standing in the running water, he peered over the embankment on his right. The paG.o.da loomed up black against the sky some distance away.

Between it and him were much lower buildings. No light was to be seen.

All was quiet. He would have liked to push his exploration further, but felt that in his ignorance of the place the risk of mistake and detection was too great. Hamid's co-operation would be necessary if he was to profit by his secret entrance, and he resolved to come to an arrangement with the cook for the following night.

Returning to his hut by the same route, he stripped off his drenched clothes, spread them on the ground at the back, out of sight, to dry, rolled himself in his blanket, and was soon asleep.

"How far are your quarters from the wall?" he asked Hamid next day, meeting him among the raspberry canes.

"Thirty good paces, sahib," replied the man.

"I wish you to meet me to-night at the wall, where the stream flows under. Have you a clock?"

"An hour-gla.s.s, sahib."

"Then let the time be two hours after lock-up. And bring a blanket with you."

"I am your servant, sahib, but if I may humbly ask----"

"Ask nothing. You can get out quietly?"

"Truly, sahib, but if bald-head nabbed me----"

"Hech! Are you afraid? Have you ever seen any of them about after nightfall?"

"Answer to both questions in negative, sahib."

"Where do they sleep?"

"Other side of Old Man's house, sahib; also across garden on left."

"Very well then. You can slip out of your quarters at any time--that's so?"

"Quite O.K., sahib."

"Very well. Be at yon arch two hours after lock-up, with a dark blanket, you mind."

"I am your servant, sahib."

But Hamid asked himself with much trouble of mind what notion the Mac Sahib had in his noddle.

Jackson's curiosity had been awakened by Mackenzie's prolonged absence on the previous night.

"Where are you off to, Mac?" he asked, seeing his companion prepare to go out again into the dark.

"I'll bide a wee before I answer you, Bob. You can't help, and if I come a mucker the less you know about it the better."

On reaching the culvert, he stripped off all his clothes and laid them beneath a bush. Too many wettings would so alter their appearance, he thought, as to draw the attention of the priests. Naked he slipped into the water, crawled through the arch, and on lifting himself slightly, saw Hamid crouching beneath the shelter of the embankment. He quitted the stream, flung about him the dark-blue blanket which the Bengali had brought, and putting his fingers to his lips, motioned to Hamid to lead him along the watercourse.

[Ill.u.s.tration: On lifting himself, he saw Hamid crouching beneath the shelter of the embankment.]

Hamid was shivering with amazement and nervousness, but he obeyed in utter silence. They waded slowly through the stream, whose gurgling drowned the sound of their own movements. Presently they ducked to avoid a low bridge that led from one part of the grounds to the other.