"The Rover Boys on the River" is the ninth installment in the Rover Boys series by Edward Stratemeyer, writing under the pseudonym Arthur Winfield. The story begins with the Rover brothers-Dick, Tom, and Sam-finishing their term at Putnam Hall military academy and planning an adventurous summer. Their uncle, Randolph Rover, offers them the use of a houseboat named the Dora, located on the Ohio River, for a summer outing. The boys are thrilled at the prospect of exploring the river and invite several friends to join them. As the cadets prepare to leave their encampment, they encounter a series of challenges. A former cadet, Lew Flapp, who harbors a grudge against the Rovers, is suspected of plotting against them. The situation escalates when the Rovers are accused of robbing a local jewelry store. Evidence, including a memorandum book and an envelope with Dick Rover's name, is found at the crime scene, leading to their temporary detention. Captain Putnam, the head of the academy, believes in the Rovers' innocence and assists in their defense. The boys suspect that the real thief planted the evidence to frame them. As the investigation unfolds, the Rovers and their friends work to clear their names and uncover the true culprit. The story is filled with suspense, humor, and the camaraderie of the young cadets as they navigate the challenges before them. The narrative captures the spirit of adventure and the importance of friendship and integrity. The Rovers' determination to prove their innocence and their ability to handle adversity with courage and wit are central themes in this engaging tale.