"You will hear from me to-morrow," was the reply.

Smith returned to the cane armchair, and Slattin, bowing to both of us, made his way to the door as I rang for the girl to show him out.

"Considering the importance of his proposal," I began, as the door closed, "you hardly received our visitor with cordiality."

"I hate to have any relations with him," answered my friend; "but we must not be squeamish respecting our instruments in dealing with Dr.

Fu-Manchu. Slattin has a rotten reputation--even for a private inquiry agent. He is little better than a blackmailer--"

"How do you know?"

"Because I called on our friend Weymouth at the Yard yesterday and looked up the man's record."

"Whatever for?"

"I knew that he was concerning himself, for some reason, in the case.

Beyond doubt he has established some sort of communication with the Chinese group; I am only wondering--"

"You don't mean--"

"Yes--I do, Petrie! I tell you he is unscrupulous enough to stoop even to that."

No doubt, Slattin knew that this gaunt, eager-eyed Burmese commissioner was vested with ultimate authority in his quest of the mighty Chinaman who represented things unutterable, whose potentialities for evil were boundless as his genius, who personified a secret danger, the extent and nature of which none of us truly understood. And, learning of these things, with unerring Semitic instinct he had sought an opening in this glittering Rialto. But there were two bidders!

"You think he may have sunk so low as to become a creature of Fu-Manchu?" I asked, aghast.

"Exactly! If it paid him well I do not doubt that he would serve that master as readily as any other. His record is about as black as it well could be. Slattin is of course an a.s.sumed name; he was known as Lieutenant Pepley when he belonged to the New York Police, and he was kicked out of the service for complicity in an unsavory Chinatown case."

"Chinatown!"

"Yes, Petrie, it made me wonder, too; and we must not forget that he is undeniably a clever scoundrel."

"Shall you keep any appointment which he may suggest?"

"Undoubtedly. But I shall not wait until tomorrow."

"What!"

"I propose to pay a little informal visit to Mr. Abel Slattin, to-night."

"At his office?"

"No; at his private residence. If, as I more than suspect, his object is to draw us into some trap, he will probably report his favorable progress to his employer to-night!"

"Then we should have followed him!"

Nayland Smith stood up and divested himself of the old shooting-jacket.

"He has been followed, Petrie," he replied, with one of his rare smiles.

"Two C.I.D. men have been watching the house all night!"

This was entirely characteristic of my friend's fa.r.s.eeing methods.

"By the way," I said, "you saw Eltham this morning. He will soon be convalescent. Where, in heaven's name, can he--"

"Don't be alarmed on his behalf, Petrie," interrupted Smith. "His life is no longer in danger."

I stared, stupidly.

"No longer in danger!"

"He received, some time yesterday, a letter, written in Chinese, upon Chinese paper, and enclosed in an ordinary business envelope, having a typewritten address and bearing a London postmark."

"Well?"

"As nearly as I can render the message in English, it reads: 'Although, because you are a brave man, you would not betray your correspondent in China, he has been discovered. He was a mandarin, and as I cannot write the name of a traitor, I may not name him. He was executed four days ago. I salute you and pray for your speedy recovery. Fu-Manchu.'"

"Fu-Manchu! But it is almost certainly a trap."

"On the contrary, Petrie--Fu-Manchu would not have written in Chinese unless he were sincere; and, to clear all doubt, I received a cable this morning reporting that the Mandarin Yen-Sun-Yat was a.s.sa.s.sinated in his own garden, in Nan-Yang, one day last week."

CHAPTER VIII. DR. FU-MANCHU STRIKES

Together we marched down the slope of the quiet, suburban avenue; to take pause before a small, detached house displaying the hatchet boards of the Estate Agent. Here we found unkempt laurel bushes and acacias run riot, from which arboreal tangle protruded the notice--"To be Let or Sold."

Smith, with an alert glance to right and left, pushed open the wooden gate and drew me in upon the gravel path. Darkness mantled all; for the nearest street lamp was fully twenty yards beyond.

From the miniature jungle bordering the path, a soft whistle sounded.

"Is that Carter?" called Smith, sharply.

A shadowy figure uprose, and vaguely I made it out for that of a man in the un.o.btrusive blue serge which is the undress uniform of the Force.

"Well?" rapped my companion.

"Mr. Slattin returned ten minutes ago, sir," reported the constable. "He came in a cab which he dismissed--"

"He has not left again?"

"A few minutes after his return," the man continued, "another cab came up, and a lady alighted."

"A lady!"

"The same, sir, that has called upon him before."

"Smith!" I whispered, plucking at his arm--"is it--"

He half turned, nodding his head; and my heart began to throb foolishly.