In the volume preceding this, entitled “The Submarine Boys and the Spies,” the third of the company’s boats, the “Benson,” named in honor of the young captain, was discovered in Florida waters.  This newest submarine had been sent to Spruce Beach, in December, to undergo some tests and to give an exhibition, the U.S. gunboat, “Waverly” being on hand to act as host.  In this volume it was related how Captain Jack’s very life was at stake, from the foreign spies gathered at Spruce Beach to pry into the secrets of the mysterious submarine.  Here the United States Secret Service officers were called in to aid, yet it was Captain Jack and his friends who contributed to the full success of the government sleuths.  At this period of his career Captain Jack’s greatest dangers came through the wiles of charming women spies, especially one beautiful young Russian woman, Mlle. Sara Nadiboff, easily the most clever of all international spies.  Yet the cleverness of the submarine boys carried them successfully, and with highest honor, through the gravest situations in their eventful, young careers.

Just at this particular time the young men had been going through dull days.  Beyond the fact of the mere presence of the heavily charged torpedoes at the shipyard there had been nothing like excitement, for some time.  This dullness, however, was destined to turn, suddenly, into the most intense and exciting activity.

As Jack pushed open the outer door of the office building of the shipyard, Jacob Farnum, the owner, happened to be bustling through the corridor.

“Hallo, boys!” came his quick, cheery greeting.  “I was just about to send for you.”

“Any word,” queried Jack, good-humoredly, “as to when that cold-molasses naval officer is going to be here!”

From within the office sounded a light laugh.

“You’ll see him shortly,” grinned Mr. Farnum.  “But come in, boys.”

As the three submarine boys entered the office, in a group, their glances fell upon two men, in the uniform of United States sailors, standing at ease near the door.  In a chair near Mr. Farnum’s desk sat a third man, dressed in ordinary citizen attire.  He was a man of about twenty-eight, dark, smooth-faced, slender of figure, yet broad-shouldered.

“Lieutenant Danvers,” called Mr. Farnum, smiling broadly, “I want to present my submarine boys to you.  First of all, Jack Benson, our young captain.”

Realizing that his question had been overheard, Jack went forward with a very red face, holding out his hand.  With a quiet smile, Lieutenant Frank Danvers, U.S.  Navy, took the boy’s hand.  Then Hal and Eph were presented.

“I see that I was mistaken about the molasses,” laughed Jack.

“Nothing as sweet as all that about the Navy, eh?” smiled Mr. Danvers.  “However, my delay in getting here was due entirely to delay in official orders.  I am now on the ground, however, and ready for prompt—­”