Well, 'Tinker Tailor Soldier Spy' is a classic in this genre. It's a complex tale of espionage with great character development. And 'Mission: Impossible' - the book version also offers exciting spy action that made it onto the NY Times best sellers list.
Sure. 'The Bourne Identity' is a great one. It follows Jason Bourne as he tries to figure out his past while being hunted. Another is 'Red Sparrow'. It has a female Russian spy at its center, full of intrigue and action.
There's also 'Alias Grace'. It combines elements of historical fiction with spy - like intrigue. The story is set in the 19th century and follows a woman who may or may not be a murderer, with lots of secrets and twists that are typical of a good spy action novel.