When she disappeared by Steph Mullin.

Margo, a recently separated woman, comes back home to take care of her father and finds out that her past is back to haunt her.

 
The characters are both unreliable and unpleasant but the plot will keep you guessing until a final twist that I didn't see coming at all.

This novel is for fans of books that are a bit creepy. I must confess that there were pages I just couldn't read because they really scared me.
If spooky books are your cup of tea this may be a good read for you.