"Well," I replied, "he was alive enough when I left him, judging from his language."

"Then why did your partner--Mr. Marwood--why did he say that you had done it?"

"That," I said softly, "is a little question which George and I have got to discuss together some day."

She walked to the door and then turned.

"If a man I had trusted and worked with behaved like that to me," she said slowly, "I should kill him."

I nodded my approval of the sentiment. "I daresay it will come to that," I said; "the only thing is one gets rather tired of being sentenced to death."

She gave me another long, curious glance out of those dark brown eyes of hers, and then going out, closed the door behind her.

For an exceedingly busy and agreeable quarter of an hour I occupied myself with the contents of the tray. There was some very nicely grilled whiting, a really fresh boiled egg, a jar of honey, and a large plate of brown bread and b.u.t.ter cut in st.u.r.dy slices. Best of all, on the edge of the tray were a couple of McMurtrie's cigarettes.

Whether he or Sonia was responsible for this last attention I could not say. I hoped it was Sonia: somehow or other I did not want to be too much indebted to Dr. McMurtrie.

I finished my meal--finished it in the most complete sense of the phrase--and then, putting down my tray on the floor, reverently lighted up. I found that my first essay in smoking on the previous evening had in no way dulled the freshness of my enjoyment, and for a few minutes I was content to lie there pleasantly indifferent to everything except the flavour of the tobacco.

Then my mind began to work. Sonia's questions had once again started a train of thought which ever since the trial had been running through my brain with maddening persistence. If I had not killed Marks, who had? How often had I asked myself that during the past three years, and how often had I abandoned the problem in utter weariness!

Sometimes, indeed, I had been almost tempted to think the jury must have been right--that I must have struck the brute on the back of the head without realizing in my anger what I was doing. Then, when I remembered how I had left him crouching against the wall, spitting out curses at me through his cut and bleeding lips, I knew that the idea was nonsense. The wound which they found in his head must have killed him instantly. No man who had received a blow like that would ever speak or move again.

The one thing I felt certain of was that in some mysterious way or other George was mixed up in the business. It was incredible that he could have acted as he did at the trial unless he had had some stronger reason than mere dislike for me. That he did dislike me I knew well, but my six years' a.s.sociation with him had taught me that he would never allow any personal motive to interfere with a chance of making money. By sending me to the gallows or into penal servitude he was practically ruining himself, for with all his acuteness and business knowledge he was quite deficient in any sort of inventive power. And yet he had not hesitated to do it, and to do it by a piece of lying sufficiently cold-blooded and deliberate to make Judas pale with envy.

If there had been any apparent chance of his being able to rob me by the proceeding, I could have understood it. But my business interests as far as past inventions went were safe in the hands of my lawyers, and although I had told him a certain amount about the new explosive which I had been working at, it was quite impossible for him to turn it to any practical use.

No, George must have had some other reason for perjuring his unpleasant soul, and the only one I could think of was that he had purposely turned the case against me in order to shield the real murderer. He had been fairly well acquainted with the dead man, I knew--their tastes indeed ran on somewhat similar lines--and it was just possible that he was aware who had committed the crime.

The thought filled me, as it always had filled me, with a bitter fury.

Again and again in my cell I had fancied myself escaping from the prison and choking the truth out of my cousin's throat with my fingers, and now that the first part of this picture had come true, I vowed silently to myself that nothing should stop the remainder from following it. Whatever McMurtrie might propose, I would see George once again face to face, even if death or recapture was the price I had to pay.

I had just arrived at this conclusion when I heard the sound of footsteps in the pa.s.sage outside. Then the handle of the door turned, and McMurtrie appeared on the threshold with Savaroff looming up behind him. There was a moment's silence, while the doctor stood there smiling down on me as blandly as ever.

"May we come in?" he inquired. "We are not interrupting your tea, I hope."

"No, I have done tea, thank you," I said, with a gesture towards the tray.

Why it was so, I can't say, but McMurtrie's politeness always filled me with a feeling of repulsion. There was something curiously sinister about it.

He stepped forward into the room, followed by Savaroff, who closed the door behind him. The latter then lounged across and sat down on the window-sill, McMurtrie remaining standing by my bedside.

"You have read the _Mail_, I see," he said, picking up the paper. "I hope you admired the size of the headlines."

"It's the type of compliment," I replied, "that I have had rather too much of."

Savaroff broke out into a short gruff laugh. "Our friend," he said, "is modest--so modest. He does not thirst for more fame. He would retire into private life if they would let him."

He chuckled to himself, as though enjoying the subtlety of his own humour. Unlike his daughter, he spoke English with a distinctly foreign accent.

"Ah, yes," said Dr. McMurtrie amiably; "but then, Mr. Lyndon is one of those people that we can't afford to spare. Talents such as his are intended for use." He took off his gla.s.ses and began to polish them thoughtfully. "One might almost say that he held them in trust--in trust for Providence."

There was a short silence.

"And is it on account of my talents that you have been kind enough to shelter me?" I asked bluntly.

The doctor readjusted his pince-nez, and seated himself with some deliberation on the foot of the bed.

"The instinct to a.s.sist a hunted fellow-creature," he observed, "is almost universal." Then he paused. "I take it, Mr. Lyndon, that you are not particularly anxious to rejoin your friends in Princetown?"

I shook my head. "Not if there is a more pleasant alternative."

Savaroff grunted. "No alternative is likely to be more unpleasant for you," he said harshly.

The touch of bullying in his tone put my back up at once. "Indeed!" I said: "I can imagine several."

McMurtrie's smooth voice intervened. "But ours, Mr. Lyndon, is one which I think will make a very special appeal to you. How would you like to keep your freedom and at the same time take up your scientific work again?"

I looked at him closely. For once there was no trace of mockery in his eyes.

"I should like it very much indeed, if it was possible," I answered.

McMurtrie leaned forward a little. "It is possible," he said quietly.

There was a short pause. Savaroff pulled out a cigar, bit off the end, and spat it into the fireplace. Then he reached sideways to the chest of drawers for a match.

"Explain to him," he said, jerking his head towards me.

McMurtrie glanced at him--it seemed to me a shade impatiently. Then he turned back to me.

"For some time before Mr. Marks's unfortunate death," he said slowly, "you had been experimenting with a new explosive."

I nodded my head. I had no idea how he had got his information, for as far as I was aware George was the only person who had any knowledge of my secret.

"And I believe you were just on the point of success when you were arrested?"

"Theoretically I was," I said. "These matters don't always work out quite so well when you put them to a practical test."

"Still, you yourself were quite satisfied with the prospects?"

I nodded again.

"And unless I am wrong, this new explosive will be immensely more powerful than anything now in use?"

"Immensely," I repeated; "in fact, there would be no practical comparison between them."

"Can you give me any idea as to its strength?"

I hesitated. "According to my calculations," I said slowly, "it ought to prove at least twenty times as powerful as gun-cotton."