Atom Mystery [Young Atom Detective]

A resourceful teenage amateur detective uses a Geiger counter to pursue a pair of linked thefts: a stolen radioactive isotope for which his father is blamed, and the disappearance of secret aircraft blueprints that suggests espionage. He and a friend search coastal rocks, tide pools, and boats, encountering suspicious strangers and gathering physical clues while weighing scientific methods against fear of spies. The story unfolds in episodic chapters that combine youthful adventure, simple detective work, and basic scientific observation as the mystery deepens.