HAPTER XVIII--SURIGNY'S NEXT MOVE 198

English and American officers join hands and one
gets a remarkable message from an international
plotter as the trail grows hot.

CHAPTER XIX--TRUTH, OR FRENCH ROMANCE 207

Dave meets an acquaintance and listens to an
astounding confession.

CHAPTER XX--THE ALLIES CLEAR FOR ACTION 213

"A submarine will sink the British battleship
to-night," is the startling information imparted by
Dave to his companions.

CHAPTER XXI--MAKING STERN WORK OF IT 223

The young American Naval officer in command of a
boarding party on the plotter's yacht, is neatly
trapped.

CHAPTER XXII--AFTER THE PEST OF THE SEAS 233

Ensign Darrin and his crew on the Navy launch make
an exciting discovery after accomplishing a
brilliant capture.

CHAPTER XXIII--THE PUZZLE OF THE DEEP 240

While engaged in a thrilling chase after an undersea
boat the launch's company find the tables
unexpectedly turned on them.

CHAPTER XXIV--CONCLUSION 249

The pursuit comes to a stirring finish, with Able
Seaman Runkle's reputation saved and Ensign Darrin
highly honored.

DAVE DARRIN

ON MEDITERRANEAN SERVICE

CHAPTER I

GREEN HAT, THE TROUBLE-STARTER

"Dan," whispered Dave Darrin, Ensign, United States Navy, to his chum
and brother officer, "do you see that fellow with the green Alpine hat
and the green vest?"

"Yes," nodded Dan Dalzell.

"Watch him."

"Why?"

"He's a powerful brute, and it looks as though he's spoiling for a
fight."

"You are not going to oblige him, are you?" asked Dalzell in a
whisper, betraying surprise.

"Nothing like it," Darrin responded disgustedly. "Danny Grin, don't
you credit me with more sense than that? Do you imagine I'd engage in
a fight in a place like this?"

"Then why are you interested in what the fellow might do?" demanded
Ensign Dan.

"Because I think there is going to be a lively time here. That fellow
under the Alpine hat is equal to at least four of these spindling
Spanish waiters. There is going to be trouble within four minutes, or
I'm a poor guesser."

"Just let Mr. Green Hat start something," chuckled Ensign Dalzell in
an undertone. "There are plenty of stalwart British soldiers he