It's a sequence of vignettes about the Service as related by Smiley during a training session for new recruits. I remember finishing the book, and feeling a profound sense of pity for the broken, fractured people working for MI6.
A lot of Le Carre's stuff deals with the same themes -- but that was the first time I ever felt what the author was trying to put across. I've not read anything with similar impact since.
I think this sentence sums up how I feel about le Carre entirely. An introduction to grownup reality.
It absolutely has that vast grey nothingness of expectation, hope, attempt, and when something eventually does happen, it turns out to have happened already and there's nothing to do about it any more. Betrayal, perhaps, but in the past tense.
Surprisingly though it is A Murder of Quality (the only Smiley novel not set in the spy world) that has stuck with me the most.
Plus as a bonus the books were still excellent reading even after knowing what happens.
Now THAT is a superb recommendation. Downloading it now.
https://en.m.wikipedia.org/wiki/Tremor_of_Intent:_An_Eschato...
Call for the Dead is a really interesting Novel too - Le Carré's first novel and shows both his evolution as a novelist and the evolution of The Circus and Smiley's colleagues. Mendel gets a bit more of a starring role.