That's basically my reading of it too. Almost everyone is incompetent or deluded, there are no heroes, and in the end Leiser is simply abandoned for reasons that are basically squalid and dishonourable. That this end happens fairly abruptly and we never discover his fate presumably reflects the reality of espionage.
According to Wikipedia [1], le Carre said that he wrote the book to satirise the idea of spying as a romantic endeavour, and British nostalgia for ww2. He also said that he regarded it as one of his most authentic works.
Robert Baer's excellent book See No Evil gives a fairly detailed account of what it's like to be an intelligence officer (in his case for the CIA) - you are basically identifying people who have useful information and then persuading them to do that, by whatever means necessary:
That's basically my reading of it too. Almost everyone is incompetent or deluded, there are no heroes, and in the end Leiser is simply abandoned for reasons that are basically squalid and dishonourable. That this end happens fairly abruptly and we never discover his fate presumably reflects the reality of espionage.
According to Wikipedia [1], le Carre said that he wrote the book to satirise the idea of spying as a romantic endeavour, and British nostalgia for ww2. He also said that he regarded it as one of his most authentic works.
[1] https://en.wikipedia.org/wiki/The_Looking_Glass_War