I'd like to put forward Echoes by Maeve Binchy
It's one of her earlier works and is quite dark in places. She was really at the height of her writing with this.
Goodreads synopsis:
https://www.goodreads.com/book/show/34301.Echoes
Amazon US
Amazon UK
Kobo
Barnes & Noble Nook US
Nook UK
This is my first ever nomination so apologies if I haven't quite got the post format right.