He was gazing at the trapdoor—which was slowly rising; inch by inch … inch by inch … Fascinatedly, raptly, we all gazed. A head appeared in the opening—and some vague, reflected light revealed two long, narrow, slightly oblique eyes watching us. They were brilliantly green.

"By God!" came in a mighty roar from Weymouth. "It's Dr. Fu-Manchu!"

As one man we leapt for the trap. It dropped, with a resounding bang— and I distinctly heard a bolt shot home.

A gutteral voice—the unmistakable, unforgettable voice of Fu-Manchu— sounded dimly from below. I turned and sprang back to the rail of the platform, peering down into the hashish house. The occupants of the divans were making for the curtained doorway. Some, who seemed to be in a state of stupor, were being assisted by the others and by the man, Ismail, who had now appeared upon the scene.

Of Kâramaneh, Zarmi, or Fu-Manchu there was no sign.

Suddenly, the lights were extinguished.

"This is maddening!" cried Nayland Smith—"maddening! No doubt they have some other exit, some hiding-place—and they are slipping through our hands!"

Inspector Weymouth blew a shrill blast upon his whistle, and Smith, running to the rail of the platform, began to shatter the panes of the skylight with his foot.

"That's hopeless, sir!" cried Weymouth. "You'd be torn to pieces on the jagged glass."

Smith desisted, with a savage exclamation, and stood beating his right fist into the palm of his left hand, and glaring madly at the Scotland Yard man.