The story takes place in Kansas.
There is a film based on the book, featuring Charlize Theron. I don’t know if it has been released yet. Here is the trailer:
There’s little more to say about the book.
I’ve reached the part in which the mystery is solved.
We get to see more of that day.
Libby goes to see her brother again.
I still don’t know enough to make a guess about what happened to the Days.