I wanted to read this for ages as I've read a few of her crime genres. I prefer the crime work. This was very well written, but it was also depressing.
For anyone who has seen the film - the book is completely different. It has the name in common and the basic premise of a world without kids, but that's about it.
The book is much better than the film, the film misses out half of the book.
This is one of those cases where the movie is better than the book. Whoever adapted the book made very radical choices and those choices worked.