I loved this book.
I loved "White Teeth" but with genius debuts you never know if the experience will be repeated. Her second "Autograph Man" I didn't really enjoy, too much abstruse Kabbalah and obscure symbolism, trying too hard.
The third "on Beauty" i enjoyed but found a bit of a slog in parts, maybe again writing too many words, too much Writing.
This one is a masterpiece.Dialogue driven, every word counts to drive the story on. Each part, as in poetry, has resonances and undercurrents, but none of it seems contrived, it looks effortless. A joy.