A reporter-narrator recounts a rapid succession of mysteries in which a resourceful investigator untangles plots of wartime espionage, political conspiracy, and organized crime. Each chapter presents a discrete case centered on a technological or scientific threat—ranging from clandestine weapons and wireless wiretapping to radiological thefts, biochemical plots, and novel forensic devices—and the methodical application of detection, experimentation, and deduction to reveal perpetrators. Themes include the ambivalence of technology, the intrusion of global conflict into civilian life, and ethical dilemmas raised by modern science, conveyed through short, episodic adventures that emphasize practical problem solving.