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Meaning: Unpredictable operative or element in a mission. Novel Title: 'Wildcard'

Meaning: An undercover spy or double agent within an organization. Novel Title: 'Tinker, Tailor, Soldier, Spy'

Meaning: Slang for assassination or murder. Novel Title: 'Red Rabbit'

Meaning: A password or custom used to distinguish members of a group. Novel Title: 'The Little Drummer Girl'

Meaning: An impasse or deadlock in espionage situations. Novel Title: 'A Death in Vienna'

Meaning: Code for a chaotic or volatile situation. Novel Title: 'Babylon Berlin'

Meaning: A term for an operative involved in particularly dangerous missions. Novel Title: 'The Bourne Identity'

Meaning: Going deep undercover; entering into a complex, disorienting situation. Novel Title: 'The Looking Glass War'

Meaning: Slang for the CIA's training facility. Novel Title: 'Red Sparrow'

Meaning: Official statement that an agent is unreliable for any operations. Novel Title: 'The Tourist'

Meaning: Agent tasked with covering up operations or disposing of evidence. Novel Title: 'The Cleaner'

Meaning: A code phrase to initiate surveillance. Novel Title: 'Tinker, Tailor, Soldier, Spy'

Meaning: Complex network of connections or a complicated plot. Novel Title: 'The Labyrinth of Osiris'

Meaning: The successful conclusion of an operation. Novel Title: 'The Eight'

Meaning: A method for passing information between agents to avoid direct contact. Novel Title: 'Dead Drop'

Meaning: An agent who infiltrates a target country and remains dormant until activated. Novel Title: 'The Faithful Spy'

Meaning: Codename for a stealthy reconnaissance mission. Novel Title: 'The Blackbird'

Meaning: Spying technique that uses romantic or sexual relationships for intel. Novel Title: 'The English Girl'

Meaning: High-altitude hideout or lookout point. Novel Title: 'Eye of the Needle'

Meaning: Signal for increased transparency and openness. Novel Title: 'The Russia House'

Meaning: An agent who downplays their skills or an operation that is intentionally understated. Novel Title: 'The Sandbaggers'