"Zarmi!" exclaimed Smith.

But his exclamation was unnecessary, for already I had recognized the evil Eurasian who was so efficient a servant of the Chinese doctor.

The wailing of the pipes continued, and now faintly I could detect the throbbing of a darabûkeh. This was el Wasr indeed. The dance commenced, its every phase followed eagerly by the motley clientele of the hashish house. Zarmi danced with an insolent nonchalance that nevertheless displayed her barbaric beauty to greatest advantage. She was lithe as a serpent, graceful as a young panther, another Lamia come to damn the souls of men with those arts denounced in a long dead age by Apolonius of Tyana.

"She seemed, at once, some penanced lady elf,
Some demon's mistress, or the demon's self…."

Entranced against my will, I watched the Eurasian until, the barbaric dance completed, she ran from the room, and the curtains concealed her from view. How my mind was torn between hope and fear that I should see Kâramaneh again! How I longed for one more glimpse of her, yet loathed the thought of her presence in that infamous house.

She was a captive; of that there could be no doubt, a captive in the hands of the giant criminal whose wiles were endless, whose resources were boundless, whose intense cunning had enabled him, for years, to weave his nefarious plots in the very heart of civilization, and remain immune. Suddenly—

"That woman is a sorceress!" muttered Nayland Smith. "There is about her something serpentine, at once repelling and fascinating. It would be of interest, Petrie, to learn what State secrets have been filched from the brains of habitues of this den, and interesting to know from what unsuspected spy-hole Fu-Manchu views his nightly catch. If …"

His voice died away, in a most curious fashion. I have since thought that here was a case of true telepathy. For, as Smith spoke of Fu-Manchu's spy-hole, the idea leapt instantly to my mind that this was it—this strange platform upon which we stood!

I drew back from the rail, turned, stared at Smith. I read in his face that our suspicions were identical. Then—

"Look! Look!" whispered Weymouth.