The Third Window
by Anne Douglas Sedgwick
Houghton Mifflin Company
The Riverside Press
This novel came up in a Google Books search for ghost stories. It has been called a psychological novel, compared to the work of Henry James. An advertisement in Publishers Weekly states: "In this novel, the pervasive sense, sweeping the world to-day, that the dead may not be dead, is transmuted into a masterpiece of fiction."
This is next up on my reading list.