“Thou wilt gain wealth and power,” the Khalifa answered. “Think, what art thou now? A mere harem slave of thy Sultan. If thou renderest me the assistance I have suggested, thou canst rise to be first in the land.”

“Thou, O Khalifa, art above all,” the Aga interrupted, as the complacent smile on Abdullah’s gross face told him that he was amenable to flattery. But a second later the expression of satisfaction gave place to a keen, crafty look, a glance, the significance of which I knew well, as he said,—

“Behold! Already the sun hath risen, and we must not tarry. The slaves will see us together and suspect. A single word whispered into the ear of thy Lord ’Othman would ruin our plan. Thou must choose now. Art thou ready to adopt my suggestion?”

In hesitation the Aga bit his finger-nails, hitched his silken robe about his shoulders, and gazed steadfastly down at the marble pavement. “Thou hast, as yet, made no definite promise as to the profits I should gain,” he muttered.

“Then give ear unto me,” said the Khalifa, in a low, earnest tone. “Thou hast admitted that we have both much to gain by the downfall of thy Sultan, therefore we must act together carefully, with perfect trust in one another. My suggestion is that exactly four moons from to-day my fighting-men, to the number of sixteen thousand, shall encamp at various points two days distant, ready to converge upon this city. On thy part, thou wilt invent some grievance against the Sultan to stir up discontent among the guards, Janissaries and slaves, and let the dissatisfaction spread to the army itself. Then, when they are ripe for revolt, an announcement will be made that the Dervishes are already in force at the city gates, and that if they are prepared to live under better conditions, with thyself as ruler under the Khalifa, they must throw down their arms. This they will assuredly do, and my Ansar will enter the city and the Fada as conquerors. They will have orders to kill the Sultan at once, and to secure his daughter Azala, of whose wondrous beauty I have heard much, for my harem. In the meantime, Katsena and Sokoto will be immediately subdued by my horsemen, and before sundown I shall be proclaimed ruler throughout the Empire. Assuredly, I shall not forget thee, and thy gains will be large. This palace, with the whole of the harem and half the treasure it containeth, shall be given unto thee, and thou wilt continue to reside here and rule on my behalf. Under my suzerainty thy power will be absolute, and with the army of the Soudan at thy back thou wilt fear none.”

“Thou temptest me, O Khalifa,” the Aga said, still undecided to turn traitor to the monarch who reposed in him the utmost confidence. “But even if thou gavest unto me this palace I should not have the means to keep it up. Of a verity I am a poor man, and—”

“Do my bidding and thou shalt be wealthy,” Abdullah exclaimed, impatiently. “As Governor of Sokoto thine expenses will come from the Treasury, therefore trouble thyself not upon that score. Stir up the revolt, and take precaution that the life of the Princess Azala is preserved; leave the rest unto me.”

“The daughter of the Sultan hath already a lover,” Khazneh said suddenly, his words causing my heart to beat so quickly that I could distinctly hear it.

“A lover!” cried the Khalifa. “Who dareth to gaze upon her with thoughts of affection?”

“A spy from thy camp.”