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-cla.s.s pract.i.tioner--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 Karamaneh, 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 Karamaneh--all were real, all were true, all were part of my life.

Nayland Smith was standing staring vaguely before him and tugging at the lobe of his left ear.

"Come along!" he snapped suddenly. "We have no more to learn here: the clue to the mystery must be sought elsewhere."

There was that in his manner whereby I knew that his thoughts were far away, as we filed out from the River Police Depot to the cab which awaited us. Pulling from his overcoat pocket a copy of a daily paper--

"Have you seen this, Weymouth?" he demanded.

With a long, nervous index finger he indicated a paragraph on the front page which appeared under the heading of "Personal." Weymouth bent frowningly over the paper, holding it close to his eyes, for this was a gloomy morning and the light in the cab was poor.

"Such things don't enter into my sphere, Mr. Smith," he replied, "but no doubt the proper department at the Yard have seen it."

"I _know_ they have seen it!" snapped Smith; "but they have also been unable to read it!"

Weymouth looked up in surprise.

"Indeed," he said. "You are interested in this, then?"

"Very! Have you any suggestion to offer respecting it?"

Moving from my seat I, also, bent over the paper and read, in growing astonishment, the following:--

ZAGAZIG-Z,-a-g-a;-z:-_I_-g,a,-a,ag-_a_,z;- I;-g:z-a-g-A-z;i-:g;-Z,,-a;-gg-_-z-i;- G;-z-,a-g-:a-Z__I_;-g:-z-a-g;-a-:Z-,i-g: z,a-g,-a:z,i-g.

"This is utterly incomprehensible! It can be nothing but some foolish practical joke! It consists merely of the word 'Zagazig' repeated six or seven times--which can have no possible significance!"

"Can't it!" snapped Smith.

"Well," I said, "what has Zagazig to do with Fu-Manchu, or to do with us?"

"Zagazig, my dear Petrie, is a very unsavory Arab town in Lower Egypt, as you know!"

He returned the paper to the pocket of his over-coat, and, noting my bewildered glance, burst into one of his sudden laughs.

"You think I am talking nonsense," he said; "but, as a matter of fact, that message in the paper has been puzzling me since it appeared-- yesterday morning--and at last I think I see the light."

He pulled out his pipe and began rapidly to load it.

"I have been growing careless of late, Petrie," he continued; and no hint of merriment remained in his voice. His gaunt face was drawn grimly, and his eyes glittered like steel. "In future I must avoid going out alone at night as much as possible."

Inspector Weymouth was staring at Smith in a puzzled way; and certainly I was every whit as mystified as he.

"I am disposed to believe," said my friend, in his rapid, incisive way, "that the dacoit met his end at the hands of a tall man, possibly dark and almost certainly clean-shaven. If this missing personage wears, on chilly nights, a long tweed traveling coat and affects soft gray hats of the Stetson pattern, I shall not be surprised."

Weymouth stared at me in frank bewilderment.

"By the way, Inspector," added Smith, a sudden gleam of inspiration entering his keen eyes--"did I not see that the s.s._Andaman_ arrived recently?"

"The Oriental Navigation Company's boat?" inquired Weymouth in a hopeless tone. "Yes. She docked yesterday evening."

"If Jack Forsyth is still chief officer, I shall look him up,"

declared Smith. "You recall his brother, Petrie?"

"Naturally; since he was done to death in my presence," I replied; for the words awoke memories of one of Dr. Fu-Manchu's most ghastly crimes, always a.s.sociated in my mind with the cry of a night-hawk.

"The divine afflatus should never be neglected," announced Nayland Smith didactically, "wild though its promptings may seem."

CHAPTER XX

THE NOTE ON THE DOOR

I saw little of Nayland Smith for the remainder of that day.

Presumably he was following those "promptings" to which he had referred, though I was unable to conjecture whither they were leading him. Then, towards dusk he arrived in a perfect whirl, figuratively sweeping me off my feet.

"Get your coat on, Petrie!" he cried; "you forget that we have a most urgent appointment!"

Beyond doubt I had forgotten that we had any appointment whatever that evening, and some surprise must have shown upon my face, for--

"Really you are becoming very forgetful!" my friend continued. "You know we can no longer trust the 'phone. I have to leave certain instructions for Weymouth at the rendezvous!"

There was a hidden significance in his manner, and, my memory harking back to an adventure which we had shared in the past, I suddenly glimpsed the depths of my own stupidity.

He suspected the presence of an eavesdropper! Yes! incredible though it might appear, we were spied upon in the New Louvre; agents of the Si-Fan, of Dr. Fu-Manchu, were actually within the walls of the great hotel!

We hurried out into the corridor, and descended by the lift to the lobby. M. Samarkan, long famous as _maitre d'hotel_ of one of Cairo's fashionable _khans_, and now princ.i.p.al of the New Louvre, greeted us with true Greek courtesy. He trusted that we should be present at some charitable function or other to be held at the hotel on the following evening.

"If possible, M. Samarkan--if possible," said Smith. "We have many demands upon our time." Then, abruptly, to me: "Come, Petrie, we will walk as far as Charing Cross and take a cab from the rank there."