"He was the most expert diamond-thief in Europe, monsieur," the officer replied. "Now, permit me to offer my apologies for the trouble to which I have put you, and to bid you farewell. At the same time, if you will allow me to do so, I will give you a little advice. If I were in your place I should leave this coast as soon as possible."

"I shall do so within a quarter of an hour, at latest," Browne answered.

With that the officer saluted once more and disappeared down the companion-ladder. A few moments later his boat was to be seen making her way in the direction of the man-of-war. Browne stood and watched her, scarcely able to realize that all danger was now passed and clone with. Then he turned to go in search of his friends, and as he did so a thought came into his mind, and brought him to a standstill once more. What could the officer have meant when he had said that the escaped convict's name was Kleinkopf, and that he was not a Nihilist, as they had been informed, but a diamond-thief; not a man who plotted and risked his life for the welfare of his country, but a common felon, who lived by defrauding the general public? Was it possible that Katherine's father could have been such a man? No; a thousand times no! He would never believe such a thing. But if it were not so, what did it all mean? Madame Bernstein had recognised the fugitive as Katherine's father, and the man himself had rejoiced at being with his daughter again after so long a separation. There was a mystery somewhere, upon which he would have to be enlightened before very long.

As he arrived at this conclusion Captain Mason approached him.

"The chief-engineer reports that all is ready, sir," he said. "If you wish it we can get under way at once."

"The sooner the better, Mason," Browne replied. "I shall not be happy until we have put the horizon between ourselves and that gentleman over there."

He nodded in the direction of the cruiser, which the boat had just reached.

"I agree with you, sir," answered the captain. "I will get the anchor away at once."

"Before you do so, Mason," said Browne, "just get those two men out of the tunnel and send them aft. Don't let them come on deck whatever you do. They're certain to have their glasses on us over yonder."

"Very good, sir," Mason returned, and went forward to execute his errand.