The Spy Who Came in From the Cold wonderfully suspenseful, clever.
Tinker Tailor Soldier Spy is essentially 70 to 90 percent non-fiction, insofar as I can tell, meaning slightly dull in places, but the masses of information about the objective reality of espionage convey a breathtaking authenticity. Highly educational.
Obsolete "omniscent" narrator, or central consciousness, but that's okay because there are no "musts" in art, or so one is told. The narrator is serious if not solemn, protag Leamas (not the most appealing name, actually kind of annoying to read over and over) grouchy, cynical, highly skilled in the tradecraft of spying; author lives in the past stylistically.
Le Carré a nom de plume for John Cornwell, carré meaning (1) square (2) straighforward, frank.