"Tinker, Tailor, Soldier, Spy" is the title of John Le Carre's 1974 spy novel about the hunt for a mole at the heart of the British Secret Intelligence Service. It was famously adapted for TV in 1979, starring Alec Guinness as George Smiley. You can watch that 6 hour TV movie from 1979 on You Tube starting HERE.
A new movie adaptation is being released in September, with an all-star cast including Gary Oldman as George Smiley, as well as Colin Firth (The King's Speech). Here's the just-released first trailer for the upcoming film: