He finished his schooling in England and then moved on to a period of sexually charged radical politics where he met Sasha, a diminutive, hobbled, leftist action junkie who will reappear throughout his life.
Most of the actual “spy stuff” that goes on is hidden even from the audience, and hinted at later in passing. Every bit of explanation you need to follow this movie is in the script, but just barely. In other words, don’t take a restroom break.
The violent and crude final pages of the book force us to scrutinise our feelings over the last three hundred pages – did we will this? Are we guilty of this ending, if only by five percent? The brutal inanity of the dialogue is a warning that in Le Carré’s world, we don’t get to argue over the proportions and scale of what we set in motion.