A look of doubt crept into the old man's eyes, and Ruxton knew that his warning had struck home.

"That possibility had not occurred to me," he said, with undisturbed simplicity.

For some moments Ruxton watched him in silence.

"How will you meet--that?" he demanded at last.

The man shrugged again.

"I must think of it. There will be a way."

"Just so. There is a way, Prince," said Ruxton, suddenly bestirring himself. "It is simple. Your real cause is the cause of humanity. Why not defy the claims of Germany? Abandon her, and yield your life to the cause so dear to your heart. Will you not land on the Yorkshire coast with me? A great welcome will await you. And--your daughter--she is in England already."

Having launched his appeal, Ruxton sat back in his seat and waited with a tense patience. Vast affairs were hanging in the balance, waiting upon the decision of this man, who was perhaps the mechanical genius of the country which claimed him.

After a while the Prince slowly shook his head. And the lack of impulse he displayed warned the other that his decision was irrevocable.

"No," he said. "To do so would be to destroy all the possibilities of the future for our cause. You will see. It is equally simple. Were I to abandon my work for Germany in the manner you suggest, they would know that I had betrayed them--and their secrets. All we have gained by the knowledge of their secrets would be lost. Then--though it matters nothing to me, for I do not value it beyond the help I can give to humanity--my life would be destroyed as sure as day follows night. No.

I go back to my shops, and to my work. I will meet every emergency as it arises. Should I fall to this man Von Salzinger I can always beat the authorities, and--make my escape."

"You are sure?"

"Ach, yes."

"Then prepare from this moment for that escape. You will have to make it. Of that I am equally--sure."

Ruxton's eyes were smiling, but without lightness. And the two men smiled into each other's eyes for some silent moments.

The Prince was the first to break the spell. It was with a glance up at the skylight overhead.

"See," he cried, not without satisfaction. "There comes the daylight.

We are on the high seas. All danger is past."

"Immediate danger," corrected Ruxton.

"Ach, so. Yes, 'immediate.'"

The old man turned to the two rolls of paper on the table beside him.

He picked them up and fondled them tenderly with his long fingers. They were to him something very precious, and--he was about to part from them.

Suddenly he held them out towards his guest. The shining light had returned to his eyes. Again had mounted to that splendid brain the hot desire to speak from the bottom of his heart.

"Take them! Take them!" he cried pa.s.sionately. "They are my children. I give them for the world. They must grow, and do for the world all that I have dreamed of into their creation. They are the plans, drawn and written in English by my own hands. No eyes but mine have seen them, and there are no others in existence. They are the plans of the U-rays light, which, by taking from them the cylinders you brought away, I have robbed Germany of the use of, and the plans of this submersible.

Safeguard them as you would your life, and lose not a moment in forcing your slow country to construct. We have agreed that you have ten years, and in ten years you can do much, if you do not let your country meanwhile sleep."

Ruxton took the proffered rolls and held them a moment while his eyes rested introspectively upon the seals.

"And the price?" he demanded, in a firm voice.

"The price! Himmel, the price!" The Prince threw up his hands in a gesture of dismay. "The price!" he repeated. "The price when humanity stands at the threshold of disaster! Ach! You are a true Englishman."

He rose from his seat and moved hurriedly across to his stateroom. At the door he paused and turned.

"There is no price," he said, and his big eyes were alight with a whimsical smile.

CHAPTER XI

BACK AT DORBY TOWERS

Sir Andrew had listened patiently. His had been the grave att.i.tude of a man impressed beyond mere words of agreement or understanding. His reading gla.s.ses had been thrust aside. His grey head was inclined towards his clasped hands, and his broad chin found support upon them.

His whole poise was of the closest attention.

"It's like a--fairy-tale," he said at last as Ruxton's story came to an end, and the deep, calm tones of his voice died out.

"Or a--nightmare?"

"Ye-es."

Sir Andrew swung round in his ample library chair and faced his desk.

It was the movement of a man stirred out of his customary calm.

Ruxton watched his father closely from his seat on the settle under the mullioned window. He was seeking the effect of his story upon a man whom he knew to be typically British at heart. He had seen it all, had experienced it all. His father had not.

Presently Sir Andrew faced him again.

"Now your--purpose," he demanded, with the air of crisp business. "You would set out to revolutionize our mercantile marine by the adoption of this--submersible."

"As rapidly as is compatible with commercial interests."

"You mean that we are to take the entire risk of the success of this new departure?"

"It is our contribution to our country's cause."

Then Ruxton drew a deep breath. He sat up, and his words came swiftly, pa.s.sionately.

"There must be no hesitation, Dad. The submersible will be no failure.

You must see this thing with my eyes, you must understand it with my understanding. What I would do is to take upon ourselves this first burden in the cause of patriotism. We must take the lead, cost us what it may. If the thing is a failure, then we are so much the poorer in this world's goods, but we shall have wrought honestly in the cause of our country. If it is the success I am sure of, then our gain is twofold. But even if the latter is fulfilled beyond my expectations it is not going to be the easy thing it looks. Listen. Hertzwohl believes that he can completely cover his tracks. I am just as certain that he cannot. Germany will discover the betrayal of her secrets. She will punish the offender in the complete manner of which she is so great a mistress. Then, by every art and wile of which she is capable, by every ruthless persistent purpose for which she is renowned, she will strive to undo the harm already achieved. We shall not be left to peaceful construction, if my understanding of the situation is correct. We may have to face even personal attack upon our lives and upon our ship-yards. It is with ideas of this sort running through my mind that I intend to lay the whole matter before the Cabinet. I intend to secure Government patronage and protection for this scheme. It is the only means by which we can hope to meet the attack which I am convinced will be forthcoming from our country's enemies. It is a lot to ask of you, Dad, at your time of life. Did I not know the great strength of your character, and the extreme loyalty you possess for our country, I should have shouldered the whole of this burden myself. As it is I know that with all your spirit you would have resented such a course.

Therefore I lay it before you."

The older man made no attempt at agreement or denial. He sat drumming his fingers upon the edge of his desk while his keen eyes twinkled in his boy's direction. He understood the earnestness of the idealist. He saw the purpose in every line of the strong young face. He appreciated the perfect poise of the keen, fresh intellect. And for the moment his mind went back to the glimpse of Paradise which had been his during the brief period of his married life. This son of his was that splendid Russian woman over again, and he was glad. But when he spoke his manner had undergone no change from his crisp business practice.

"You would have us build----?"

"Two vessels of three thousand tons each and incorporate them with our coastwise fleet. Then two deep-sea craft of say six thousand tons. I would lay these down at once. Once their success is proved the plans can be laid open to all our shipping world. When the time comes the Government must be induced to foster the new construction by subsidy, and by every other means in its power. But in the first instance we alone must bear the burden and all it involves. If disaster should overtake our efforts our justification remains. The days of Britain's pre-war inept.i.tude are so recent that even an active progressive failure would be a matter scarcely to be deplored. We must convince the world of the sincerity of our convictions, and, to do that, we must, if need be, risk our entire fortune. The danger we know lies ahead. In Britain it is useless to tell of it. Only our own actions can speak and carry convictions. It is our plain and simple duty to put our all into this thing. If it should bring us disaster or even simple ruin, I tell you, Dad, I would rather spend the rest of my life in honest rags, with the knowledge that my substance has been absorbed in an endeavor to help my country, than claim this beautiful home of ours as a view-point from which to watch the triumph of our country's enemies."