From The Spy Who Came in from the Cold to Tinker Tailor to the Bourne films. The genre that uses tradecraft as moral architecture.
The spy thriller is the genre whose currency is information — who has it, who is concealing it, who has misread it. The genre's best entries use spycraft not as set-piece decoration but as moral architecture. The questions are about loyalty, deception, the cost of working inside institutions whose ethics are conditional.
The James Bond franchise has produced twenty-six films since 1962 (the EON Productions series; one additional non-canonical entry). The peaks of the tradition: From Russia with Love (1963), Goldfinger (1964), On Her Majesty's Secret Service (1969), Casino Royale (2006), and Skyfall (2012). The Daniel Craig era (Casino Royale, Quantum of Solace, Skyfall, Spectre, No Time to Die) is widely considered the franchise's most-serious sustained period.
The spy thriller, properly, is about information rather than physical conflict. The films that succeed in the genre are the ones where the protagonist's competence is intellectual rather than purely physical — Smiley's reading of human motivation in Tinker Tailor, Tony Mendez's cultural intuition in Argo, the Israeli team's moral disintegration in Munich. The action-heavy spy films (the Bourne series, recent Bond) are excellent but operate in a slightly different tradition.