“Good-bye, my Captain,” she said, sadly.

“Good-bye, Mademoiselle,” answered the submarine boy.  “And remember that you are done with the spies.”

“Forever!  Again, good-bye, my Captain.”

As both craft moved off on their respective courses Captain Benson saw a little white handkerchief fluttering at the freighter’s stern rail.  As long as it could be visible over the waters that handkerchief fluttered.  “I guess the little Russian must have tied her handkerchief there,” observed Eph, dryly, and Captain Jack smiled; while Jacob Farnum turned to whisper to the inventor: 

“Dave, our youthful captain has the greatest respect in the world for a woman, but he’ll never be made a fool of by one of the wrong kind.”

Henceforth, as long as she remained at Spruce Beach, the submarine craft was wholly unmolested and avoided by spies.  Gaston, who turned out to be the real leader of one party, instead of M. Lemaire, was sentenced to prison for assault.  Leroux and his Greek accomplice confessed to the attempt to explode the mine under the “Benson,” and were sent to the penitentiary.  There, also, journeyed M. Lemaire, for a long term, on account of his all but successful shot at Jack Benson.

With the exception of those sent to prison none of the spies have as yet been heard from.

For a considerable time the “Benson” remained at, or near, Spruce Beach.  Hennessy’s articles attracted great attention to the craft.  The Navy people were charmed by the new capabilities shown by this latest of the Pollard submarine boats.

Later the submarine boys were destined to turn their attention to new and thrilling work with submarine craft And now came most stirring times that put their grit, intelligence and resource to the hardest kind of tests.

These newest happenings will be related in full in the next volume of this series, which will appear under the title:  “The Submarine Boys’ Lightning Cruise; Or, The Young Kings of the Deep.” The reader of this new volume will find a rare treat in store for him!