"But the first stage is nearly seventy feet above us. Even a.s.suming that there were an entrance there--which I doubt--escape by that means would be impossible. No one could climb down the face of the pyramid from above; no one has ever succeeded in climbing up. For the purpose of surveying the pyramid a scaffold had to be erected. Its sides are quite unscaleable."

"That may be," agreed Dr. Cairn; "but, nevertheless, I have my reasons for placing a guard over the south side. If anything appears upon the stage above, Rob--_anything_--shoot, and shoot straight!"

He repeated the same instructions to Ali Mohammed, to the evident surprise of the latter.

"I don't understand at all," muttered Sime, "but as I presume you have a good reason for what you do, let it be as you propose. Can you give me any idea respecting what we may hope to find inside this place? I only entered once, and I am not anxious to repeat the experiment. The air is unbreathable, the descent to the level pa.s.sage below is stiff work, and, apart from the inconvenience of navigating the latter pa.s.sage, which as you probably know is only sixteen inches high, the climb up the vertical shaft into the tomb is not a particularly safe one. I exclude the possibility of snakes," he added ironically.

"You have also omitted the possibility of Antony Ferrara," said Dr.

Cairn.

"Pardon my scepticism, doctor, but I cannot imagine any man voluntarily remaining in that awful place."

"Yet I am greatly mistaken if he is not there!"

"Then he is trapped!" said Sime grimly, examining a Browning pistol which he carried. "Unless--"

He stopped, and an expression, almost of fear, crept over his stoical features.

"That sixteen-inch pa.s.sage," he muttered--"with Antony Ferrara at the further end!"

"Exactly!" said Dr. Cairn. "But I consider it my duty to the world to proceed. I warn you that you are about to face the greatest peril, probably, which you will ever be called upon to encounter. I do not ask you to do this. I am quite prepared to go alone."

"That remark was wholly unnecessary, doctor," said Sime rather truculently. "Suppose the other two proceed to their post."

"But, sir--" began Robert Cairn.

"You know the way," said the doctor, with an air of finality. "There is not a moment to waste, and although I fear that we are too late, it is just possible we may be in time to prevent a dreadful crime."

The tall Egyptian and Robert Cairn went stumbling off amongst the heaps of rubbish and broken masonry, until an angle of the great wall concealed them from view. Then the two who remained continued the climb yet higher, following the narrow, zigzag path leading up to the entrance of the descending pa.s.sage. Immediately under the square black hole they stood and glanced at one another.

"We may as well leave our outer garments here," said Sime. "I note that you wear rubber-soled shoes, but I shall remove my boots, as otherwise I should be unable to obtain any foothold."

Dr. Cairn nodded, and without more ado proceeded to strip off his coat, an example which was followed by Sime. It was as he stooped and placed his hat upon the little bundle of clothes at his feet that Dr.

Cairn detected something which caused him to stoop yet lower and to peer at that dark object on the ground with a strange intentness.

"What is it?" jerked Sime, glancing back at him.

Dr. Cairn, from a hip pocket, took out an electric lamp, and directed the white ray upon something lying on the splintered fragments of granite.

It was a bat, a fairly large one, and a clot of blood marked the place where its head had been. For the bat was decapitated!

As though antic.i.p.ating what he should find there, Dr. Cairn flashed the ray of the lamp all about the ground in the vicinity of the entrance to the pyramid. Scores of dead bats, headless, lay there.

"For G.o.d's sake, what does this mean?" whispered Sime, glancing apprehensively into the black entrance beside him.

"It means," answered Cairn, in a low voice, "that my suspicion, almost incredible though it seems, was well founded. Steel yourself against the task that is before you, Sime; we stand upon the borderland of strange horrors."

Sime hesitated to touch any of the dead bats, surveying them with an ill-concealed repugnance.

"What kind of creature," he whispered, "has done this?"

"One of a kind that the world has not known for many ages! The most evil kind of creature conceivable--a man-devil!"

"But what does he want with bats' heads?"

"The Cynonycteris, or pyramid bat, has a leaf-like appendage beside the nose. A gland in this secretes a rare oil. This oil is one of the ingredients of the incense which is never named in the magical writings."

Sime shuddered.

"Here!" said Dr. Cairn, proffering a flask. "This is only the overture! No nerves."

The other nodded shortly, and poured out a peg of brandy.

"Now," said Dr. Cairn, "shall I go ahead?"

"As you like," replied Sime quietly, and again quite master of himself. "Look out for snakes. I will carry the light and you can keep yours handy in case you may need it."

Dr. Cairn drew himself up into the entrance. The pa.s.sage was less than four feet high, and generations of sand-storms had polished its sloping granite floor so as to render it impossible to descend except by resting one's hands on the roof above and lowering one's self foot by foot.

A pa.s.sage of this description, descending at a sharp angle for over two hundred feet, is not particularly easy to negotiate, and progress was slow. Dr. Cairn at every five yards or so would stop, and, with the pocket-lamp which he carried, would examine the sandy floor and the crevices between the huge blocks composing the pa.s.sage, in quest of those faint tracks which warn the traveller that a serpent has recently pa.s.sed that way. Then, replacing his lamp, he would proceed.

Sime followed in like manner, employing only one hand to support himself, and, with the other, constantly directing the ray of his pocket torch past his companion, and down into the blackness beneath.

Out in the desert the atmosphere had been sufficiently hot, but now with every step it grew hotter and hotter. That indescribable smell, as of a decay begun in remote ages, that rises with the impalpable dust in these mysterious labyrinths of Ancient Egypt which never know the light of day, rose stiflingly; until, at some forty or fifty feet below the level of the sand outside, respiration became difficult, and the two paused, bathed in perspiration and gasping for air.

"Another thirty or forty feet," panted Sime, "and we shall be in the level pa.s.sage. There is a sort of low, artificial cavern there, you may remember, where, although we cannot stand upright, we can sit and rest for a few moments."

Speech was exhausting, and no further words were exchanged until the bottom of the slope was reached, and the combined lights of the two pocket-lamps showed them that they had reached a tiny chamber irregularly hewn in the living rock. This also was less than four feet high, but its jagged floor being level, they were enabled to pause here for a while.

"Do you notice something unfamiliar in the smell of the place?"

Dr. Cairn was the speaker. Sime nodded, wiping the perspiration from his face the while.

"It was bad enough when I came here before," he said hoa.r.s.ely. "It is terrible work for a heavy man. But to-night it seems to be reeking. I have smelt nothing like it in my life."

"Correct," replied Dr. Cairn grimly. "I trust that, once clear of this place, you will never smell it again."

"What is it?"

"It is the _incense_," was the reply. "Come! The worst of our task is before us yet."

The continuation of the pa.s.sage now showed as an opening no more than fifteen to seventeen inches high. It was necessary, therefore, to lie p.r.o.ne upon the rubbish of the floor, and to proceed serpent fashion; one could not even employ one's knees, so low was the roof, but was compelled to progress by clutching at the irregularities in the wall, and by digging the elbows into the splintered stones one crawled upon!

For three yards or so they proceeded thus. Then Dr. Cairn lay suddenly still.

"What is it?" whispered Sime.

A threat of panic was in his voice. He dared not conjecture what would happen if either should be overcome in that evil-smelling burrow, deep in the bowels of the ancient building. At that moment it seemed to him, absurdly enough, that the weight of the giant pile rested upon his back, was crushing him, pressing the life out from his body as he lay there p.r.o.ne, with his eyes fixed upon the rubber soles of Dr.

Cairn's shoes, directly in front of him.