I got the screw of the accursed thing loosened, but the act of removing the jacket was too agonizing for Eltham—­man of iron though he was.  I laid him swooning on the floor.

“Where is Fu-Manchu?”

Nayland Smith, from just within the door, threw out the query in a tone of stark amaze.  I stood up—­I could do nothing more for the poor victim at the moment—­and looked about me.  The room was innocent of furniture, save for heaps of rubbish on the floor, and a tin oil-lamp hung, on the wall.  The dead Chinaman lay close beside Smith.  There was no second door, the one window was barred, and from this room we had heard the voice, the unmistakable, unforgettable voice, of Dr. Fu-Manchu.

But Dr. Fu-Manchu was not there!

Neither of us could accept the fact for a moment; we stood there, looking from the dead man to the tortured man who only swooned, in a state of helpless incredulity.

Then the explanation flashed upon us both, simultaneously, and with a cry of baffled rage Smith leaped along the passage to the second door.  It was wide open.  I stood at his elbow when he swept its emptiness with the ray of his pocket-lamp.

There was a speaking-tube fixed between the two rooms!

Smith literally ground his teeth.

“Yet, Petrie,” he said, “we have learnt something.  Fu-Manchu had evidently promised Eltham his life if he would divulge the name of his correspondent.  He meant to keep his word; it is a sidelight on his character.”

“How so?”

“Eltham has never seen Dr. Fu-Manchu, but Eltham knows certain parts of China better than you know the Strand.  Probably, if he saw Fu-Manchu, he would recognize him for who he really is, and this, it seems, the Doctor is anxious to avoid.”

We ran back to where we had left Karamaneh.

The room was empty!

“Defeated, Petrie!” said Smith, bitterly.  “The Yellow Devil is loosed on London again!”

He leaned from the window and the skirl of a police whistle split the stillness of the night.

CHAPTER IV

THE CRY OF A NIGHTHAWK

Such were the episodes that marked the coming of Dr. Fu-Manchu to London, that awakened fears long dormant and reopened old wounds—­nay, poured poison into them.  I strove desperately, by close attention to my professional duties, to banish the very memory of Karamaneh from my mind; desperately, but how vainly!  Peace was for me no more, joy was gone from the world, and only mockery remained as my portion.

Poor Eltham we had placed in a nursing establishment, where his indescribable hurts could be properly tended:  and his uncomplaining fortitude not infrequently made me thoroughly ashamed of myself.  Needless to say, Smith had made such other arrangements as were necessary to safeguard the injured man, and these proved so successful that the malignant being whose plans they thwarted abandoned his designs upon the heroic clergyman and directed his attention elsewhere, as I must now proceed to relate.