An espionage or spy mystery is a subgenre of thriller or mystery fiction that revolves around espionage, intelligence agencies, and undercover operations. These stories typically feature spies, secret agents, and government operatives engaged in covert missions, espionage, and counterintelligence activities. Espionage mysteries often involve complex plots, political intrigue, and high-stakes espionage operations, with protagonists navigating a web of deception, betrayal, and danger as they uncover hidden agendas and thwart enemy plots.