“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 Harêm Suite, see that he does not come out again! There is no time for further explanation, Kernaby Pasha; it is Omar of Ispahân with whom we have to deal!”

V

Perched up amid the foliage of the acacia, I commenced that singular guard imposed upon me by Abû Tabâh. 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 Harêm Suite!

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