"The Boy Scouts on a Submarine" by John Blaine is a children's adventure novel likely written in the early 20th century. The story centers around a group of young scouts who find themselves embroiled in a thrilling plot involving espionage, a dangerous invention, and a mysterious visitor. The opening chapters introduce key characters, including Lester Pomeroy, who has created a powerful gas weapon, and his sister Elinor, who are both caught up in the danger that ensues when someone attempts to steal the formula for his invention. The opening of the book sets a dramatic tone with the unexpected attack on Lester, leaving him gravely injured and raising the stakes for Elinor and her younger brother, Wugs, who are determined to uncover the truth behind the incident. As they navigate the chaos, they enlist the help of their fellow scouts, notably the Potter twins, Porky and Beany, who are eager to assist. Together, they discover a web of intrigue involving spies and a shadowy figure known as the Wolf. The tension builds as the scouts work to piece together clues in order to not only save Lester but also stop those who threaten their country. The stakes intensify as the narrative unfolds, blending elements of mystery and adventure that will engage young readers. (This is an automatically generated summary.)