Best movie I've seen in a couple of years.....
https://www.gq.com/story/one-of-the-best-cold-war-spy-movies-is-streaming-on-netflix
The plot of Tinker Tailor Soldier Spy is dense and complex, but revolves around George Smiley (Gary Oldman in excellently frumpy form) being brought out of retirement to figure out who is the Soviet "mole" at the upper levels of "the Circus," aka the British intelligence agency. John Le Carré—who worked as a spy for the British Government before writing novels—loosely based the story on the real life KBG double agent Kim Philby. Smiley finds himself in a tangled web of paranoid schemers and bureaucratic infighting as he tries to figure out which spy is the double agent.
https://www.gq.com/story/one-of-the-best-cold-war-spy-movies-is-streaming-on-netflix

The plot of Tinker Tailor Soldier Spy is dense and complex, but revolves around George Smiley (Gary Oldman in excellently frumpy form) being brought out of retirement to figure out who is the Soviet "mole" at the upper levels of "the Circus," aka the British intelligence agency. John Le Carré—who worked as a spy for the British Government before writing novels—loosely based the story on the real life KBG double agent Kim Philby. Smiley finds himself in a tangled web of paranoid schemers and bureaucratic infighting as he tries to figure out which spy is the double agent.