A well-done 1979 drama directed by the late great Otto Preminger adapted from Greene’s novel. clever dialogue by Tom Stoppard and well-acted by Nicol Williamson (whom I met at McNally when he was in town) and Richard Attenborough, John Gielgud, Derek Jacobi, Robert Morley, Ann Todd, and the African supermodel IMan (as Williamson’s wife).
Lots of intrigue of the Who-is-the traitor-to the Russians? variety. Spies and counterspies with many interesting scenes. Nice use of sets and color by Preminger. There are layers of twists with Williamson trying to stay together with his African wife. If you like British drama and Le Carre books, this is a worthy complement by the guy who invented spy thriller fiction literature before Ian Fleming/James Bond back in the 1940s.
Spoiler: Preminger’s film chooses a realistic conclusion which may a letdown for romantics.