It's New York in the 1940s, where the martinis flow from cocktail hour till breakfast at Tiffany's. And nice girls don't, except, of course, for Holly Golightly: glittering socialite traveller, generally upwards, sometimes sideways and once in a while - down.
After a routine security check by George Smiley, civil servant Samuel Fennan apparently kills himself. When Smiley finds Circus head Maston is trying to blame him for the man's death, he begins his own investigation, meeting with Fennan's widow to find out what could have led him to such desperation.