"I cannot rest, Petrie," he said. "I am itching to get to work. Yet, a false move, and—" He lighted his pipe, and stood staring from the window.

"I shall, of course, take a needle-syringe with me," I explained.

Smith made no reply.

"If I but knew the composition of the drug which produced the semblance of death," I continued, "my fame would long survive my ashes."

My friend did not turn. But:

"She said it was something he put in the wine?" he jerked.

"In the wine, yes."

Silence fell. My thoughts reverted to Karamaneh, whom Dr. Fu-Manchu held in bonds stronger than any slave-chains. For, with Aziz, her brother, suspended between life and death, what could she do save obey the mandates of the cunning Chinaman? What perverted genius was his! If that treasury of obscure wisdom which he, perhaps alone of living men, had rifled, could but be thrown open to the sick and suffering, the name of Dr. Fu-Manchu would rank with the golden ones in the history of healing.

Nayland Smith suddenly turned, and the expression upon his face amazed me.

"Look up the next train to L—!" he rapped.