"But why did they induce you to entice me to that house in Lambeth? Why did they so evidently desire that I should be killed?"

"By accident," he interrupted, correcting me. "Always by accident," and he smiled grimly.

"Surely you know their secret motive?" I remarked.

"At the time I did not," he declared. "I acted on their instructions, being compelled to, for they hold my future in their hands. Therefore I could not disobey. You knew too much, therefore you were marked down for death—just as you are now."

"And who is it who is now seeking my life?" I inquired gravely. "I only returned from Russia yesterday."

"Your movements are well known," answered the young Italian. "You cannot be too careful. Woodroffe has been in Russia with you, has he not?"

I replied in the affirmative, whereupon he said:

"I thought so, but was not quite sure."

"And Chater?" I inquired; "where is he?"

"In London."

"And the Leithcourts?"

He shrugged his shoulders with a gesture of ignorance, adding: "The Signorina Muriel returned to London from Eastbourne this morning."

"Where can I find her?" I inquired eagerly. "It is of the utmost importance that I should see her."

"She is with a relation, a cousin, I think, at Bassett Road, Notting Hill. The house is called 'Holmwood.'"

"You have seen her?"

"No. I heard she had returned."

"And her father is still in hiding from Chater?"

"He is still in hiding, but Chater is his best friend."

"That is curious," I remarked, recollecting the hurried departure from Rannoch. "They've made it up, I suppose?"

"They never quarreled, to my knowledge."

"Then why did Leithcourt leave Scotland so hurriedly on Chater's arrival? You know all about the affair, of course?"

He nodded, saying with a grim smile, "Yes; I know. The party up there must have been a very interesting one. If the police could have made a raid on the place they would have found among the guests certain persons long 'wanted.' But the arrival of Chater and the flight of Leithcourt had an ulterior object. Chater had never been Leithcourt's enemy."

"But I can't understand that," I said. "Why should Leithcourt have attacked Chater, rendered him unconscious, and shut him up in the cupboard in the library?"

"Was it Leithcourt who did that?" he asked dubiously. "I think not. It was another of the guests who was Chater's bitterest enemy. But Philip Leithcourt took advantage of the fracas in order to make believe that he had fled because of Chater's arrival. Ah!" he added, "you haven't any idea of their ruses. They are amazing!"

"So it seems," I said, nevertheless only half convinced that the Italian was telling me the truth. If it was really, as he had said, that the arrival of Chater and the flight was merely a "blind," then the mystery was again deepened.

"Then who was the man who attacked Chater?" I asked.

"Only Chater himself knows. It was one of the guests, that is quite evident."

"And you say that the flight had been prearranged?" I remarked.

"Yes, with a distinct motive," he said; then, after a pause, he added, with a strange, earnest look in his dark eyes, "Pardon me, Signor Commendatore, if I presume to suggest something, will you not?"

"Certainly. What do you suggest?"

"That you should remain here, in this hotel, and not venture out."

"For fear of something unfortunate happening to me!" I laughed. "I'm really not afraid, Olinto," I added. "You know I carry this," and I drew out my revolver from my hip-pocket.

"I know, signore," he said anxiously. "But you might not be afforded opportunity for using it. When they lay a trap they bait it well."

"I know. They're a set of the most ingenious scoundrels in London, it is very evident. Yet I don't fear them in the least," I declared. "I must rescue the Signorina Heath."

"But, signore, have a care for yourself," cried the Italian, laying his hand upon my arm. "You are a marked man. Ah! do I not know," he exclaimed breathlessly. "If you go out you may run right into—well, the fatal accident."

"Never fear, Olinto," I said reassuringly. "I shall keep my eyes well open. Here, in London, one's life is safer than anywhere else in the world, perhaps—certainly safer than in some places I could name in your own country, eh?" at which he grinned.

The next moment he grew serious again, and said:

"I only warn the signore that if he goes out it is at his own peril."

"Then let it be so," I laughed, feeling self-confident that no one could lead me into any trap. I was neither a foreigner nor a country cousin. I knew London too well. He was silent and shook his head; then, after telling me that he was still at the same restaurant in Westbourne Grove, he took his departure, warning me once more not to go forth.

Half an hour later, disregarding his words, I strode out into the Strand, and again walked round to the "Junior." The short wintry day had ended, the gas-lamps were lit, and the darkness of night was gradually creeping on.

Jack had not been to the club, and I began now to grow thoroughly uneasy. He had parted from me at the corner of the Strand with only a five minutes' walk before him, and yet he had apparently disappeared. My first impulse was to drive to Notting Hill to inquire of Muriel if she had news of him, but somehow the Italian's warning words made me wonder if he had met with foul play.

I suddenly recollected those two men who had passed by as we had talked, and how that the features of one had seemed strangely familiar. Therefore I took a cab to the police-station down at Whitehall, and made inquiry of the inspector on duty in the big bare office with its flaring gas-jets in wire globes. He heard me to the end, then turning back the book of "occurrences" before him, glanced through the ruled entries.

"I should think this is the gentleman, sir," he said. And he read to me the entry as follows:

"P.C. 462A reports that at 2.07 a.m., while on duty outside the National Gallery, he heard a revolver shot, followed by a man's cry. He ran to the corner of Suffolk Street, where he found a gentleman lying upon the pavement suffering from a serious shot-wound in the chest and quite unconscious. He obtained the assistance of P.C.'s 218A and 343A, and the gentleman, who was not identified, was taken to the Charing Cross Hospital, where the house-surgeon expressed a doubt whether he could live. Neither P.C.'s recollect having noticed any suspicious-looking person in the vicinity.

"JOHN PERCIVAL, Inspector."

I waited for no more, but rushed round to the hospital in the cab, and was, five minutes later, taken along the ward, where I identified poor Jack lying in bed, white-faced and unconscious.

"The doctor was here a quarter of an hour ago," whispered the sister. "And he fears he is sinking."

"He has uttered no words?" I asked anxiously. "Made no statement?"

"None. He has never regained consciousness, and I fear, sir, he never will. It is a case of deliberate murder, the police told me early this morning."

I clenched my fists and swore a fierce revenge for that dastardly act. And as I stood beside the narrow bed, I realized that what Olinto had said regarding my own peril was the actual truth. I was a marked man. Was I never to penetrate that inscrutable and ever-increasing mystery?