So this is embarrassing. I knew the Deep Blue Something song, "Breakfast at Tiffany's" before I knew that there was a book! And whenever I so much as catch a glimpse of the book on my table, I get that silly song in my head. I think that is called an earworm.
Despite the associated earworm, this was a really good story. One aspect of it that was especially cool is how Holly's story is presented through her neighbor - who starts out disinterested but winds up being intrigued and caring about her, enough where he helps her leave at the end.
I'm surprised that I never read this before!