I have read most of John Le Carre’s novels, starting in the 80s. With the Cold War on it was easy to imagine being in the stories.
There have been some really good movies based on his books, too. Two superb recent ones that come to mind are Tinker Tailor Soldier Spy (2011) and A Most Wanted Man (2014).
The 2016 BBC six part series The Night Manager was excellent, too. That’s free with Amazon Prime if you have it.
In real life, I knew a guy who was a CIA agent in the in the early 60s. He told me about shooting pictures of surveillance targets with a mini camera and developing film in his hotel room. And he was peripherally involved in the Bay of Pigs invasion of Cuba.