I nodded.

"This is what I want to ask you: Did you, or did you not, see that shadow?"

I stared him hard in the face.

"I remember the episode to which you refer," I replied. "I certainly saw a shadow."

"But what sort of shadow?"

"To me it seemed an indefinite, shapeless thing, as though caused by someone moving behind the curtain."

"It didn't look to you like--the shadow of a hand?"

"It might have been, but I could not be positive."

Adderley groaned.

"Knox," he said, "money is a curse. It has been a curse to me. If I have had my fun, G.o.d knows I have paid for it."

"Your idea of fun is probably a peculiar one," I said dryly.

Let me confess that I was only suffering the man's society because of an intense curiosity which now possessed me on learning that the lady of Katong was still in Adderley's company.

Whether my repugnance for his society would have enabled me to remain any longer I cannot say. But as if Fate had deliberately planned that I should become a witness of the concluding phases of this secret drama, we were now interrupted a second time, and again in a dramatic fashion.

Adderley's nondescript valet came in with letters and a rather large brown paper parcel sealed and fastened with great care.

As the man went out:

"Surely that is from Singapore," muttered Adderley, taking up the parcel.

He seemed to become temporarily oblivious of my presence, and his face grew even more haggard as he studied the writing upon the wrapper.

With unsteady fingers he untied it, and I lingered, watching curiously.

Presently out from the wrappings he took a very beautiful casket of ebony and ivory, cunningly carved and standing upon four claw-like ivory legs.

"What the devil's this?" he muttered.

He opened the box, which was lined with sandal-wood, and thereupon started back with a great cry, recoiling from the casket as though it had contained an adder. My former sentiments forgotten, I stepped forward and peered into the interior. Then I, in turn, recoiled.

In the box lay a shrivelled yellow hand--with long tapering and well-manicured nails--neatly severed at the wrist!

The nail of the index finger was enclosed in a tiny, delicately fashioned case of gold, upon which were engraved a number of Chinese characters.

Adderley sank down again upon the settee.

"My G.o.d!" he whispered, "his hand! His hand! He has sent me his hand!"

He began laughing. Whereupon, since I could see that the man was practically hysterical because of his mysterious fears:

"Stop that," I said sharply. "Pull yourself together, Adderley. What the deuce is the matter with you?"

"Take it away!" he moaned, "take it away. Take the accursed thing away!"

"I admit it is an unpleasant gift to send to anybody," I said, "but probably you know more about it than I do."

"Take it away," he repeated. "Take it away, for G.o.d's sake, take it away, Knox!"

He was quite beyond reason, and therefore:

"Very well," I said, and wrapped the casket in the brown paper in which it had come. "What do you want me to do with it?"

"Throw it in the river," he answered. "Burn it. Do anything you like with it, but take it out of my sight!"

III

THE GOLD-CASED NAIL

As I descended to the street the liftman regarded me in a curious and rather significant way. Finally, just as I was about to step out into the hall:

"Excuse me, sir," he said, having evidently decided that I was a fit person to converse with, "but are you a friend of Mr. Adderley's?"

"Why do you ask?"

"Well, sir, I hope you will excuse me, but at times I have thought the gentleman was just a little bit queer, like."

"You mean insane?" I asked sharply.

"Well, sir, I don't know, but he is always asking me if I can see shadows and things in the lift, and sometimes when he comes in late of a night he absolutely gives me the cold shivers, he does."

I lingered, the box under my arm, reluctant to obtain confidences from a servant, but at the same time keenly interested. Thus encouraged:

"Then there's that lady friend of his who is always coming here," the man continued. "She's haunted by shadows, too." He paused, watching me narrowly.

"There's nothing better in this world than a clean conscience, sir," he concluded.

Having returned to my room at the hotel, I set down the mysterious parcel, surveying it with much disfavour. That it contained the hand of the Mandarin Quong I could not doubt, the hand which had been amputated by Dr. Matheson. Its appearance in that dramatic fashion confirmed Matheson's idea that the mandarin's injury had been received at the hands of Adderley. What did all this portend, unless that the Mandarin Quong was dead? And if he were dead why was Adderley more afraid of him dead than he had been of him living?

I thought of the haunting shadow, I thought of the night at Katong, and I thought of Dr. Matheson's words when he had told us of his discovery of the Chinaman lying in the road that night outside Singapore.

I felt strangely disinclined to touch the relic, and it was only after some moments' hesitation that I undid the wrappings and raised the lid of the casket. Dusk was very near and I had not yet lighted the lamps; therefore at first I doubted the evidence of my senses. But having lighted up and peered long and anxiously into the sandal-wood lining of the casket I could doubt no longer.

The casket was empty!