"Nothing more?" pressed Dan.

Dave was thoughtful for a few moments before he replied:

"Danny, boy, we have our orders from the commander of the fleet. If we encounter Mr. Green Hat anywhere in the future, we are to report the fact. That is the extent of our instructions, and I think we shall do very well not to think too much about the matter, but to be ready, at all times, to follow our orders."

"I was in hope that you could evolve something more romantic than that," returned Dalzell disappointedly.

"It is very likely," went on Dave judicially, "that we have already had as large a hand in the affair as we are going to have. I doubt if we shall hear anything more of Mr. Green Hat; even if we hear of his further deeds, we are not likely to have any personal part in them."

"I'm disappointed," Dan admitted, rising. "I'm going to bed now, for I have to be up at half-past three, to turn out on watch at eight bells. You, lucky dog, have no watch to stand until after breakfast.

Good night, Dave!"

"Good night; and don't dream of Mr. Green Hat," smiled Darrin. "You'll never see him again."

In that prediction Ensign Darrin was destined to find himself fearfully wide of the mark. Mr. Green Hat was not to be so easily dropped from the future calculations of the youngest naval officers on the "Hudson."

None of our readers require any introduction to Dave Darrin and Dan Dalzell, ofttimes known as "Danny Grin." These two fast friends in the naval service were members of "d.i.c.k & Co.," a famous s.e.xtette of schoolboys in Gridley. d.i.c.k Prescott, Greg Holmes, Dave Darrin, Dan Dalzell, Tom Reade and Harry Hazelton first appeared in the pages of "THE GRAMMAR SCHOOL BOYS SERIES," in which volumes were described the early lives of these young American schoolboys.

We found the six boys again in the pages of the "HIGH SCHOOL BOYS SERIES," in the volumes of which the athletic triumphs of d.i.c.k & Co.

were vividly set forth. In the "HIGH SCHOOL BOYS' VACATION SERIES"

were recounted their further adventures.

At the conclusion of their high school careers the six chums separated to seek different fields of endeavor. d.i.c.k Prescott and Greg Holmes secured appointments as cadets at the United States Military Academy at West Point, as narrated in the "WEST POINT SERIES." Dave Darrin and Dan Dalzell were nominated as midshipmen to the United States Naval Academy at Annapolis, and all that befell them there is set forth in the "ANNAPOLIS SERIES." The great things that happened to Tom Reade and Harry Hazelton are told in the volumes of the "YOUNG ENGINEERS SERIES." d.i.c.k Prescott's and Greg Holmes' adventures in the Army, after graduation from West Point, are set forth in the volumes of the "BOYS OF THE ARMY SERIES."

The "DAVE DARRIN SERIES" is devoted to the lives of Dave Darrin and Dan Dalzell as naval officers, after their graduation from the Naval Academy. We now find them serving as ensigns, this being the lowest rank among commissioned officers of the United States Navy.

The first volume of this series, published under the t.i.tle, "DAVE DARRIN AT VERA CRUZ," tells the story of Dave's and Dan's initial active service in the United States Navy. That our two young ensigns took an exciting part in the fighting there is known to all our readers.

For some time after the taking of Vera Cruz by the United States forces and the arrival of Regular Army regiments, Dave and Dan continued to serve with constant credit aboard the "Long Island,"

stationed at Vera Cruz. Then followed their detachment from the "Long Island," and their return to the United States. They were then ordered to duty with the Mediterranean Squadron, aboard the flagship "Hudson."

We already know what befell them on their arrival at their first port of call, the British fortress of Gibraltar, and in the quaint old Moorish city of the same name, which stands between the fortress and the harbor.

Dan soon took his leave of his chum, going to his own quarters for a short sleep before going on duty at eight bells in the morning. Dave, having opportunity to sleep until shortly before breakfast, sat for some minutes pondering over his strange meeting with Mr. Green Hat, whom he now knew as Emil Gortchky, a notorious international spy.

Still puzzling, Darrin turned out the light and dropped into his berth. Once there the habit of the service came strongly upon him. He was between the sheets to sleep, so, with a final sigh, he shut out thoughts of Mr. Green Hat, of the admiral's remarks, and of the whole train of events of the evening. Within a hundred and twenty seconds he was sound asleep. It was an orderly going the rounds in the early morning who spoke to Ensign Darrin and awakened him.

"Is the ship under way?" asked Dave, rolling over and opening his eyes.

"Aye, aye, sir," responded the orderly, who then wheeled and departed.

Dave was quickly out of his berth, and dressed in time to join the gathering throng of the "Hudson's" officers in the ward-room, where every officer, except the captain, takes his meals.

"Have you heard the port for which we're bound, Danny?" Darrin asked his chum.

"Not a word," replied Dalzell, shaking his head.

"Perhaps we shall find out at breakfast," commented Dave.

A minute later the signal came for the officers to seat themselves.

Then, after orders had been given to the attentive Filipino boys, who served as mess attendants, a buzz of conversation ran around the table.

Soon the heavy, booming voice of Lieutenant Commander Metson was heard as he asked Commander Dawson, the executive officer:

"Sir, are we privileged to ask our port of destination?"

This is a question often put to the executive officer of a war vessel, for ninety-nine times out of a hundred he knows the answer. He _may_ smile and reply:

"I do not know."

Sometimes the executive officer, who is the captain's confidential man, has good reasons for not divulging the destination of the ship.

In that case his denial of knowledge is understood to be only a courteous statement that he does not deem it discreet to name the port of destination.

But in this instance Commander Dawson smiled and replied:

"I will not make any secret of our destination so far as I know it. We are bound for some port on the Riviera. It may be Nice, or perhaps Monte Carlo. I am informed that the admiral has not yet decided definitely. I shall be quite ready to tell you, Mr. Metson, as soon as I know."

"Thank you, sir," courteously acknowledged the lieutenant commander.

During this interval the buzz of conversation had died down. It soon began again.

"The Riviera!" exclaimed Ensign Dalzell jubilantly, though in a low tone intended mainly for his chum's ear. "I have always wanted to see that busy little strip of beach."

The Riviera, as will be seen by reference to a map of Southern Europe, is a narrow strip of land, between the mountains and the sea, running around the Gulf of Genoa. One of the most important watering places on this long strip of beach is Nice, on French soil, where mult.i.tudes of health and pleasure seekers flock annually. The mild, nearly tropical climate of this place in winter makes Nice one of the most attractive resorts along the Riviera. Only a few miles distant from Nice is the princ.i.p.ality of Monte Carlo, an independent state under a prince who is absolute ruler of his tiny country. Monaco is but two and a quarter miles long, while its width varies from a hundred and sixty-five yards to eleven hundred yards. Yet this "toy country" is large enough to contain three towns of fair size. The most noted town, Monte Carlo, stands mainly on a cliff, and is the location of the most notorious gambling resort in the world, the "Casino."

"I wonder," suggested one of the younger officers, in a rumbling voice, "if our Government feels that we officers have more money than we need, and so is sending us to a place where we can get rid of it by gambling. What do you say, Darrin?"

"Monte Carlo is one of the noted spots of the world," Dave responded slowly, "and I shall be glad to see a place of which I have heard and read so much. But I shall not gamble at Monte Carlo. I can make better use of my money and of my character."

"Bravo!" agreed Totten.

"How long is that strip of beach, the Riviera?" asked one officer of Lieutenant Commander Wales, the navigating officer.

"From Nice to Genoa, which is what is commonly understood as the real Riviera," replied the navigating officer; "the distance is one hundred and sixteen miles. But, beyond Genoa, on the other side, the beach continues for fifty-six miles to Spezia. On the strip from Genoa to Spezia the sh.o.r.e is so rocky that it has been found necessary to construct eighty-odd tunnels through the headlands for the railway that runs the whole length of the Riviera."

Most of the talk, during that breakfast hour, was about the Riviera, and much of that had to do with Monte Carlo.

"For years I've wanted very particularly to see that town of Monte Carlo," Danny Grin confessed.

"Not to gamble, I hope," replied Dave.

"Millions for sight-seeing, but not a cent for gambling," Dalzell paraphrased lightly.

"Gentlemen," warned Mr. Wales, "don't be too certain that you'll see Monte Carlo on this cruise. Often the weather is too rough for a landing in that vicinity."

"And in that case?" queried Lieutenant Totten.

"In that case," replied Wales, "the usual rule is for the ship to go on to anchorage in the harbor at Genoa."