I was shocked by the end as I truly didn't expect it. As usual Asimov is addictive and I can't stop reading his books until I finish them.
This book was particularly interesting because it reflects, more than previous books, on the concept of tradition and human nature.
The idea that we humans can become acquainted with the idea of living without human contact or without the notion of family relationships seems quite interesting. How the author explores this new "ways of living" of both the Spatials and the Terrestrian from the point of view of Baley is captivating and reflects the possible futures of our world, with its advantages and disadvantages.
The only thing I didn't quite understand was the sexual intercourse between Elijah and Gladia. I felt like it was out of context for Asimov's style of writing and the topics he usually writes about.