Rooms by Lauren Oliver. After Richard Walker dies, leaving behind a vast country estate, his estranged family arrives for their inheritance, while long-dead former residents bound to the house observe the family and reminisce about their past lives--until both the human and spirit worlds collide.
The Woman In White by Wilkie Collins: I highly recommend this large tome. It's worth your time. I love a mystery that I am unable to unravel until the author allows. And this kept me rapt until the last.