The original Rover Boys were brothers Tom, Sam, and Dick Rover. Their children (Fred, son of Sam Rover; Jack, son of Dick; Andy and Randy, twin sons of Tom) became the main characters of the “second series” that began with Volume 21, The Rover Boys at Colby Hall, published in 1917. The elder Rovers continued making appearances in the second series.
The Rovers were students at a military boarding school: adventurous, prank-playing, flirtatious, and often unchaperoned adolescents who were frequently causing mischief for authorities as well as criminals.
The series often incorporated novel technology of the era, such as the automobile, airplanes (The Rover Boys in the Air) and news events, such as World War I.