"But, good Heaven!" cried M. Balabas, "I was speaking to you less than ten minutes ago!"

"You are mad!" groaned Chundermeyer, rubbing his bruised wrists. "Have I not been locked in the wardrobe all night!"

"Ah, merciful saints," cried M. Balabas, dramatically raising his clenched fists to heaven, "I see it all! You understand, Mr. Kernaby.

It is _not_ Mr. Chundermeyer with whom we have been conversing, in whose hands you have been placing your valuables, it is that devil incarnate who three years ago impersonated the Emir al-Hadj, in order to steal the Holy Carpet; who can impersonate anyone; who, it is said, can transform himself at will into an old woman, a camel, or a fig tree; it is the conjuror, the wizard--Omar of Ispahan!"

My own ideas were almost equally chaotic; for although, as I now recalled, I had never throughout the evening obtained a thoroughly good view of the features of the Veiled Prophet, I could have sworn to the voice, to the carriage, to the manner of Mr. Chundermeyer.

The puzzling absence of Chief Inspector Carlisle now engaged everybody's attention; and, acting upon the precedent afforded by the finding of Mr. Chundermeyer, we paid a visit to the detective's room.

Inspector Carlisle, fully dressed, and still wearing a soft felt hat, as though he had but just come in, lay on the floor, unconscious, with the greater part of a cigar, which examination showed to be drugged, close beside him.

As I entered my room that night and switched on the light, in through the open window from the balcony stepped Ab Tabah.

His frequent and mysterious appearances in my private apartments did not surprise me in the least, and I had even ceased to wonder how he accomplished them; but--

"You are too late, my friend," I said. "Omar of Ispahan has outwitted you."

"Omar of Ispahan has outwitted men wiser than I," he replied gravely; "but covetousness is a treacherous master, and I am not without hope that we may yet circ.u.mvent the father of thieves."

"You are surely jesting," I replied. "In all probability he is now far from Cairo."

"I, on the contrary, have reason to believe," replied Ab Tabah calmly, "that he is neither far from Cairo, far from the hotel, nor far from this very apartment."

His manner was strange and I discovered excitement to be growing within me.

"Accompany me on the balcony," he said; "but first extinguish the light."

A moment later I stood looking down upon the moon-bathed gardens, and Ab Tabah, beside me, stretched out his hand.

"You see the projecting portion of the building yonder?"

"Yes," I replied; "the Harem Suite."

"Immediately before the window there is a palm tree."

"I have observed it."

"And upon the opposite side of the path there is an acacia."

"Yes; I see it."

"The moon is high, and whilst all the side of the hotel is in shadow the acacia is in the moonlight. Its branches would afford concealment, however; and one watching there could see what would be hidden from one on this balcony. I request you, Kernaby Pasha, to approach that _lebbekh_ tree from the further side of the fountain, in order to remain invisible from the hotel. Climb to one of the lower branches, and closely watch four windows."

I stared at him in the darkness.

"Which are the four windows that I am to watch?"

"They are--one, that immediately below your own; two, that to the right of it; three, the window above the Harem Suite; and, four, the extreme east window of this wing, on the first floor."

Now, my state of mystification grew even denser. For the windows specified were, in the order of mention, that of Inspector Carlisle, who had not yet recovered consciousness; of Mr. Chundermeyer; of Major Redpath, a retired Anglo-Indian who had been confined to his room for some time with an attack of malaria; and of M. Balabas, the manager.

"For what," I inquired, "am I to watch?"

"For a man to descend."

"And then?"

"You will hold your open watch case where it is clearly visible from this spot. Instant upon the man's appearance you will cover it up, and then uncover it, either once, twice, thrice, or four times."

"After which?"

"Remain scrupulously concealed. Have the collar of your dinner jacket turned up in order to betray as little whiteness as possible. Do not interfere with the man who descends; but if he enters the Harem Suite, see that he does not come out again! There is no time for further explanation, Kernaby Pasha; it is Omar of Ispahan with whom we have to deal!"

V

Perched up amid the foliage of the acacia, I commenced that singular guard imposed upon me by Ab Tabah. Did he suspect one of these four persons of being the notorious Omar? Or had his mysterious instructions some other significance? The problem defied me; and, recognizing that I was hopelessly at sea, I abandoned useless conjecture and merely watched.

Nor was my vigil a long one. I doubt if I had been at my post for ten minutes ere a vague figure appeared upon the shadow-veiled balcony of one of the suspected windows--that of Major Redpath, above the Harem Suite!

Scarcely daring to credit my eyes, I saw the figure throw down on to the projecting top of the _mushrabiyeh_ window below a slender rope ladder. I covered the gleaming gold of my watch-case with my hand, and gave the signal--_three_.

The spirit of phantasy embraced me; and, unmoved to further surprise, I watched the unknown swarm down the ladder with the agility of an ape. He seemed to wear a robe, surely that of the _Veiled Prophet_!

He silently manipulated one of the side-panels of the window, opened it, and vanished within the Harem Suite.

Raising my eyes, I beheld a second figure--that of Ab Tabah--descending a similar ladder to the balcony of Inspector Carlisle's room. He gained the balcony and entered the room. Four seconds elapsed; he reappeared, unfurled a greater length of ladder, and came down to the flower-beds. Lithely as a cat he came to the projecting _mushrabiyeh_, swung himself aloft, and as I watched breathlessly, expecting him to enter in pursuit of the intruder, climbed to the top and began to mount the ladder descending from Major Redpath's room!

He had just reached the major's balcony, and was stepping through the open window, when a most alarming din arose in the Harem Suite; evidently a fierce struggle was proceeding in the apartments of the Mudir's daughter!

I scrambled down from the acacia and ran to the spot immediately below the window, arriving at the very moment that the central lattice was thrown open, and a white-veiled figure appeared there and prepared to spring down! Perceiving my approach:

"Oh, help me, in the name of Allah!" cried the woman, in a voice shrill with fear. "Quick--catch me!"

Ere I could frame any reply, she clutched at the palm tree and dropped down right into my extended arms, as a crashing of overturned furniture came from the room above.

"Help them!" she entreated. "You are armed, and my women are being murdered."

"Help, Kernaby Pasha!" now reached my ears, in the unmistakable voice of Ab Tabah, from somewhere within. "See that he does not escape from the window!"

"Coming!" I cried.

And, by means of the palm trunk, I began to mount towards the open lattice.

Gaining my objective, I stumbled into a room which presented a scene of the wildest disorder. It was a large apartment, well but spa.r.s.ely furnished in the Eastern manner, and lighted by three hanging lamps.

Directly under one of these, beside an overturned cabinet of richly carven wood inlaid with mother-o'-pearl, lay a Nubian, insensible, and arrayed only in shirt and trousers. There was no one else in the room, and, not pausing to explore those which opened out of it, I ran and unbolted the heavy door upon which Ab Tabah was clamoring for admittance.