Jack Armstrong #7

When a crucial intercity baseball game draws big-league scouts to watch promising young second baseman Tommy Byrnes, Jack Armstrong's afternoon takes a dangerous turn: Uncle Jim Fairfield arrives with news that a secret military device called the Intro-Ray Set has been stolen—a weapon capable of paralyzing the human body. As Tommy mysteriously struggles with basic plays on the field while gamblers circle and suspicion grows, Jack must figure out who's weaponizing the device and why before the game's final inning.

Frank O'Bannon, a young Boy Scout trained in first aid, springs into action when his brother Robert gets into trouble during a swim in the Blue River—seized by cramps in the cold water after overheating from playing ball. Drawing on his Red Cross training and quick thinking, Frank works to save Robert's life, performing the techniques that keep his brother breathing until help arrives. This true account of courage and preparedness earned Frank O'Bannon recognition as a winner of the Jack Armstrong All-American Award in 1948.

In "The Counterfeiters," Jack Armstrong teams up with scientist Vic Hardy to uncover a local gang of forgers, turning a lesson in currency forensics into a real-world chase. With sharp eyes and quick thinking, the duo races to outwit criminals before the counterfeit money spreads further.

Billy Fairfield is determined to win the fifty-dollar prize at the amateur show with a magician act, but his rival Egbert Sneery seems to have the crowd in his corner with a flashy performance. When Billy takes the stage with his own egg-juggling trick—a risky bit of sleight of hand involving real eggs—something unexpected happens that turns the tables and wins him first prize in the most original way possible.

In "Lion on the Loose," Betty teams up with her friend Molly Madden, the circus’s star trapeze artist, when a lion breaks free and sends the big top into chaos. With quick thinking and a daring plan, Betty steps in to help calm the situation—just as the spotlight turns on her.