Savaroff uttered a hoa.r.s.e exclamation and sat upright in his seat.

"Are you speaking the truth?" he asked roughly.

I stared him full in the face, and then without answering turned back to McMurtrie.

The latter made a gesture with his hand. "Leave the matter to me, Savaroff," he said sharply. "I understand Mr. Lyndon better than you do." Then addressing me: "Supposing you had all the things that you required, how long would it take you to manufacture some of this powder--or whatever it is?"

"It's difficult to say," I answered. "Perhaps a week; perhaps a couple of months. I could make the actual stuff at once provided I had the materials, but it's a question of doing it in such a way that one can handle it safely for practical purposes. I was experimenting on that very point at the time of my arrest."

McMurtrie nodded his head slowly. "You have been candid with us,"

he said, "and now I will be equally candid with you. My friend M.

Savaroff and myself are very largely interested in the manufacture of high explosives. The appearance of an invention like yours on the market would be a very serious matter indeed for us. On the other hand, if we had control of it, we should, I imagine, be in a position to dictate our own terms."

"You certainly would," I said; "there is no question about that. My explosive would be no more expensive to manufacture than cordite."

"So you see when some exceedingly convenient chance brought you in through our kitchen window it naturally occurred to me to invite you to stay and discuss the matter. You happen to be in a position in which you could be useful to us, and I think that we, on the other hand, might be of some a.s.sistance to you."

He leant back and watched me with that cold smile of his.

"What do you say, Mr. Lyndon?" he added.

I did some rapid but necessary thinking. It was quite true that the new explosive would knock the bottom out of the present methods of manufacture, and McMurtrie's interests in the matter might well be large enough to make him run the risk of helping me. There seemed no reason to doubt that he was speaking the truth--and yet, somehow or other I mistrusted him--mistrusted him from my soul.

"How did you know about my experiments?" I asked quietly.

He shrugged his shoulders. "There are such things as trade secrets. It is necessary for a business man to keep in touch with anything that may threaten his interests."

I hesitated a second. "What is it that you propose--exactly?" I inquired.

I saw--or thought I saw--the faintest possible gleam of satisfaction steal into his eyes.

"I propose that you should finish your experiments as soon as possible, make some of this explosive, and hand the actual stuff and the full secret of its manufacture over to us. In return I will guarantee you your freedom, and let you have a quarter interest in all profits we make out of your invention."

He brought out these somewhat startling terms as coolly as though it were an every-day custom of his to do business with escaped convicts.

I bent down from the bed, and under cover of picking up my second cigarette from the tray, secured a few useful moments for considering the situation.

"I have no objection to the bargain," I said slowly, helping myself to a match off the table; "the only question is whether it is possible to carry it out. My experiments aren't the kind that can be conducted in a back bedroom. I should want a large shed of some kind, and the farther away it was from any houses the better. There is always the chance of blowing oneself up at this sort of business, and in that case an explosive like mine would probably wreck everything within a couple of miles."

"You shall work under any conditions you please," said McMurtrie amiably. "If it suits you we will fix you up a hut and some sheds down on the Thames marshes, and you can live there till the experiments are finished."

"But I should be recognized," I objected. "I am bound to be recognized. I am fairly well known as it is, and with my picture and description placarded all over England, I shouldn't stand a dog's chance. However lonely a place it was, some one would be bound to see me and give me away sooner or later."

McMurtrie shook his head. "You may be seen," he said, "but there is no reason why you should be recognized."

I paused in the act of lighting my cigarette. "What do you mean?" I asked with some curiosity.

"My dear Mr. Lyndon," said McMurtrie, courteously, "as a scientist yourself you don't imagine that it's beyond the art of an intelligent surgeon to cope with a little difficulty like that?"

"But in what way?" I objected. "A disguise? Any one can see through a disguise except in novels."

The doctor smiled. "I am not suggesting a wig and a pair of spectacles," he observed. "It is rather too late in the world's history for that sort of thing." Then he stopped and studied me for an instant attentively. "In a fortnight, and practically without hurting you," he added, "I can make you as safe from the police as if you were dead and buried."

I sat up in bed. "Under the circ.u.mstances," I said, "you'll excuse my being a little inquisitive."

"Oh, there is no secret about it. Any surgeon could do it. I have only to alter the shape of your nose a trifle, and make your forehead rather higher and wider. A stain of some sort will do the rest."

"Yes," I said; "but what about the first part of the programme?"

He shrugged his shoulders. "Child's play," he answered. "Merely a question of paraffin injections and the X-rays."

He spoke with such careless confidence that for once it was impossible to doubt his sincerity.

I lay back again and drew in a large exulting lungful of cigarette smoke. I had suddenly realized that if McMurtrie's offer was genuine, and he could really do what he promised, there were no longer any difficulties in the way of my getting at George. The idea of meeting him, and perhaps even speaking to him, without his being able to recognize me filled me with a wicked satisfaction that no words can do justice to.

I don't think I betrayed my emotion, however, for McMurtrie's keen eyes were on me, and I was not in the least anxious to take him into my confidence. I blew out the smoke in a grey cloud, and then, raising myself on my elbow carefully flicked the ash off my cigarette.

"How am I to know that you will keep your promise?" I asked.

Savaroff made an angry movement, but before he could speak, McMurtrie had broken in.

"You forget what an embarra.s.sing position we shall be putting ourselves in, Mr. Lyndon," he said with perfect good temper.

"Shielding a runaway convict is an indictable offence--to say nothing of altering his appearance. As for the money"--he made a little gesture of contempt--"well, do you think it would pay us to cheat you?

There is always the chance that a gentleman who can invent things like this explosive and the Lyndon-Marwood torpedo may have other equally satisfactory notions."

"Very well," I said quietly. "I will accept the offer on one condition--that I can have a week in London before beginning work."

With an oath Savaroff started up from the window-sill.

"Gott in Himmel! and who are you to make terms?" he exclaimed roughly.

"Why, we have only to send you back to the prison and you will be flogged like a dog!"

"In which distressing event," I observed, "you would not get your explosive."

"My dear Savaroff," interrupted McMurtrie, soothingly, "there is no need to threaten Mr. Lyndon. I am sure that he appreciates the situation." Then he turned to me. "I suppose you have some reason for making this condition?"

Silently in my heart I invoked the shade of Ananias.

"If you had been in Dartmoor three years," I said, with a rather well-forced laugh, "you would find several excellent reasons for wanting a week in London."

My acting must have been good, for I could have sworn I saw a faint expression of relieved contempt flicker across McMurtrie's face.

"I see. A little holiday--a brief taste of the pleasures of liberty!

Well, that seems to me a very natural and reasonable request. What do you think, Savaroff?"

That gentleman contented himself with a singularly ungracious grunt.

"I don't think there would be much risk about it," I said boldly. "If you can change my appearance as completely as you say you can, no one would be the least likely to recognize me. After three years of that dog's life up there I can't settle down in a hut on the Thames marshes without having a few days' fun first. I should be very careful what I did naturally. I have had quite enough of the prison to appreciate being outside."

McMurtrie nodded. "Very well," he said slowly. "I see no objection to your having your 'few days' fun' in London if you want them. It would be safer perhaps to get you away from this house as soon as possible.