Readers of that preceding volume will recall how Dave Darrin and Dan Dalzell entered the United States Naval Academy, one appointed by a Congressman and the other by a United States Senator. Such readers will remember the difficult time that Dave and Dan had in getting through the work of the first hard, grinding year. They will also recall how Dave Darrin, when accused of treachery to his classmates, patiently bided his time until he, with the aid of some close friends, was able to demonstrate his innocence. Our readers will also remember how two evil-minded members of the then fourth class plotted to increase Damn's disgrace and to drive him out of the brigade; also how these two plotters, Midshipmen Henkel and Brimmer, were caught in their plotting and were themselves forced out of the brigade. Our readers know that before the end of the first year at the Naval Academy, Dave had fully reinstated himself in the esteem of his manly classmates, and how he quickly became the most popular and respected member of his class. It was now only the day after the events whose narration closed the preceding volume. Dave Darrin and Dalzell were first of all brought to notice in "THE HIGH SCHOOL BOYS' SERIES." In their High School days, back in Gridley, these two had been famous members of Dick & Co., a sextette of youngsters who had made a name for themselves in school athletics. Dick Prescott and Greg Holmes, two other members of the sextette, had been appointed to the United States Military Academy at West Point, where they were serving in the corps of cadets and learning how to become Army officers in the not far distant future. All of the adventures of Dick and Greg are set forth in "THE WEST POINT SERIES." The two remaining members of famous old Dick & Co., Tom Reade and Harry Hazelton, became civil engineers, and went West for their first taste of engineering work. Tom and Harry had some wonderful and startling adventures, as fully set forth in "THE YOUNG ENGINEERS' SERIES." On this early June day when we again encounter Dave Darrin and Dan Dalzell in their handsome Naval uniforms, all members of the first, second and third classes were due to be aboard one of the three great battleships that lay off the Yard at Annapolis at four p.m. These three great battleships were the "Massachusetts," the "Iowa" and the "Indiana." These three huge, turreted fighting craft had their full crews aboard. Not one of the battleship commanders would allow a "jackie" ashore, except on business, through fear that many of the "wilder" ones might find the attractions on shore too alluring, and fail to return in time. With the young midshipmen it was different. These young men were officially and actually gentlemen, and could be trusted. Yet here, in the back room of this laundry, was one who was apparently not dependable. This young midshipman's name was Pennington, and the fact was that he lay in deep stupor from the effects of smoking opium!