A group of seven cadets centered on Mark Mallory confronts hazing, rival classmates, and a series of mysteries when they discover evidence of stolen valuables. The narrative follows episodic investigations, night watches, and daring schemes to outwit burglars and recover the treasure, including traps, captures, and a dramatic rescue. Alongside physical confrontations and undercover tactics, characters face tests of courage and loyalty that expose cowardice and bravery, and the plot resolves through clever detective work, negotiated releases, and moral reckonings.