"No proof," said the detective. "I set to work on bare suspicion, and leave proof to the last. In this case my suspicions are well founded. A few days before war was declared, a man, passing himself off as 'Lewis Valentine,' landed at Liverpool, having crossed from New York on the 'Olympic.' He is known to have stayed at the 'Hotel Magnificent,' and is supposed to have remained in London about three weeks. Afterwards, evidence was forthcoming to the effect that he was one of the Prussian military attachés in the United States, who was engaged upon Secret Service work. Two days ago rumours reached me that this man was once again in England; and the very reason I was late here to-night is that I was first obliged to go to the 'Magnificent,' where I learned that Valentine had left not an hour before. Take my word for it, this fellow is von Essling."

"And he has gone to Edinburgh?" asked Jimmy.

"Not a bit of it!" said Etheridge. "It is no more likely he would tell a charwoman his destination than his real name and business. He has gone to Liverpool; and that's all the more probable since the 'Baltic' sails early to-morrow morning."

"Thunder!" cried Crouch. "This is a greater game than big-game shooting in the Sunderbunds. I never in my life picked up a spoor like this."

"One thing's a certainty," said Etheridge; "I leave for Liverpool without delay. There's no fast train till morning; but I can get there in an eighty horse-power car. But, first, you must both come with me to the Admiralty. Jarvis," he added, turning to one of the policemen, "don't forget to drop into the White Star offices to-morrow morning, and tell them there's no fear this voyage that the 'Baltic' will be torpedoed."

[CHAPTER XX--Commander Fells]

For reasons which are usually described as having regard to the public interest, and also because of the Censorship in war-time, it is not possible to relate in any detail the interview that took place between Jimmy Burke and Captain Crouch and a certain Admiralty official, who may as well be called the Director-in-Chief of the Naval Secret Service.

This gentleman--by name Commander Fells--knew the superintendent-detective as well as any of his own immediate subordinates. Though it was by then past ten o'clock at night, they found him in his office, hard at work. Though he wore the uniform of a naval officer with the three gold stripes of his rank on either sleeve, his was the pale careworn face of a man who works at a desk--moreover, for long hours of the night.

Etheridge stayed no longer than was necessary to introduce Crouch and Jimmy, and to explain the important business upon which they desired to see Commander Fells. The detective then took his departure in haste on being told that the enormous Rolls-Royce car for which he had telephoned to Scotland Yard was waiting for him in Whitehall, outside the iron gates that guard the entrance of the Admiralty.

Alone with his visitors, the Commander lay back in his chair, and closing one eye, looked hard at Jimmy with the other. A little later, he twisted round sideways, so that his elbow rested on the back of the chair--a position that enabled him with comfort to bite the end of his thumb--a habit not to be encouraged in those who are still at school, but excusable no doubt (for the sake of Empire) in Commander Fells. A singular thing in this man, who was undoubtedly one of the powers-that-be in the Navy, was that he wore no medal ribbons on the left side of his coat, the sole decoration with which he had ever been honoured being the plain blue medal of the Royal Humane Society for saving life at sea.