Serena by Ron Rash
While it may sound harsh, I think this is probably a better movie than book. The story was not terrible but the characters were lacking in any real dimension. The attributes of the title character (and I am being circumspect to avoid spoilers) were never fully explained and while not unbelievable just left you thinking of her more as a caricature than a character of depth and substance.
Good for a read if you don’t want to think too much about the story. Very much Dan Brown territory