This is one of the most stunning pieces of fiction I've ever read. The prose is hypnotic and, similar to The Haunting of Hill House, Jackson's presents us with a point of view character that we slowly realize is unreliable and unbalanced (but fascinating) as a narrator of a very strange history. It is a testimony to Jackson's abilities as a writer that she makes both Mary Katherine and Constance such sympathetic characters to the reader. Highly recommended. I've come late to Shirley Jackson, but am going to track down everything she wrote.