Fully two weeks elapsed ere Nayland Smith's arduous labors at last met with a slight reward. For a moment, the curtain of mystery surrounding the Si-Fan was lifted, and we had a glimpse of that organization's elaborate mechanism. I cannot better commence my relation of the episodes associated with the Zagazig's cryptogram than from the moment when I found myself bending over a prostrate form extended upon the table in the Inspector's room at the River Police Depôt. It was that of a man who looked like a Lascar, who wore an ill-fitting slop-shop suit of blue, soaked and stained and clinging hideously to his body. His dank black hair was streaked upon his low brow; and his face, although it was notable for a sort of evil leer, had assumed in death another and more dreadful expression.  
Asphyxiation had accounted for his end beyond doubt, but there were marks about his throat of clutching fingers, his tongue protruded, and the look in the dead eyes was appalling.
 
"He was amongst the piles upholding the old wharf at the back of the
Joy-Shop?" said Smith tersely, turning to the police officer in charge.
 
"Exactly" was the reply. "The in-coming tide had jammed him right up under a cross-beam."
 
"What time was that?'
 
"Well, at high tide last night. Hewson, returning with the ten o'clock boat, noticed the moonlight glittering upon the knife."
 
The knife to which the Inspector referred possessed a long curved blade of a kind with which I had become terribly familiar in the past. The dead man still clutched the hilt of the weapon in his right hand, and it now lay with the blade resting crosswise upon his breast. I stared in a fascinated way at this mysterious and tragic flotsam of old Thames.
 
Glancing up, I found Nayland Smith's gray eyes watching me.
 
"You see the mark, Petrie?" he snapped.
 
I nodded. The dead man upon the table was a Burmese dacoit!
 
"What do you make of it?" I said slowly.
 
"At the moment," replied Smith, "I scarcely know what to make of it. You are agreed with the divisional surgeon that the man—unquestionably a dacoit—died, not from drowning, but from strangulation. From evidence we have heard, it would appear that the encounter which resulted in the body being hurled in the river, actually took place upon the wharf-end beneath which he was found. And we know that a place formerly used by the Si-Fan group—in other words, by Dr. Fu-Manchu— adjoins the wharf. I am tempted to believe that this"—he nodded towards the ghastly and sinister object upon the table—"was a servant of the Chinese Doctor. In other words, we see before us one whom Fu-Manchu has rebuked for some shortcoming."
 
I shuddered coldly. Familiar as I should have been with the methods of the dread Chinaman, with his callous disregard of human suffering, of human life, of human law, I could not reconcile my ideas—the ideas of a modern, ordinary middle-class practitioner—with these Far Eastern devilries which were taking place in London.
 
Even now I sometimes found myself doubting the reality of the whole thing; found myself reviewing the history of the Eastern doctor and of the horrible group of murderers surrounding him, with an incredulity almost unbelievable in one who had been actually in contact not only with the servants of the Chinaman, but with the sinister Fu-Manchu himself. Then, to restore me to grips with reality, would come the thought of Kâramaneh, of the beautiful girl whose love had brought me seemingly endless sorrow and whose love for me had brought her once again into the power of that mysterious, implacable being.
 
This thought was enough. With its coming, fantasy vanished; and I knew that the dead dacoit, his great curved knife yet clutched in his hand, the Yellow menace hanging over London, over England, over the civilized world, the absence, the heart-breaking absence, of Kâramaneh—all were real, all were true, all were part of my life.
 
Nayland Smith was standing staring vaguely before him and tuggin............