This one is much more direct a link and much more definite. Le Carre's son, Nick Harkaway has taken up the mantle and written a Smiley novel that apparently fits into a 10 year gap in the narrative from the original books by his dad.
I have never read a Smiley novel, nor seen a film so I have no idea who any of the characters are.
Sadly, that seems to have left me at a huge disadvantage where this is concerned. This was a book group read. Those who know the Smiley books in my book group (everyone but me) loved it.
I was just perpetually confused. Smiley was looking for some Russian sleeper agent who'd just left London after his son was arrested in eastern Europe. I have no idea why this character might have been of importance.
This just seemed like a low stakes, low speed follow around Europe with endless info-dumps and cameos from characters I had no idea about. Sadly, none of the info-dumps managed to assign any importance to the chase. No one in the book knew the importance of the character they were chasing, therefore neither did this particular reader.
I found the end of the chase was spectacularly anti-climatic and IMHO it failed to provide any answers. Again, to people who knew the franchise, this was a brilliant close to the book.
This is not a standalone book clearly. The writing is very nice. It flows well. It just flows into either a sea of brilliance if you know the characters and surrounding story, or into an abyss of who gives a damn for people like me.
Apparently, Mr Harkaway has pulled off a perfect imitation of his late father's prose style. I couldn't possibly comment whether he has or not.
I scored it 5/10 because it's certainly a well written book from a prose perspective. Unless you're already intimately knowledgeable about the rest of the series, it's going to fall down very flat.