I read this to evaluate it as a potential book club selection. One of our members absolutely refuses to read "horror," so we were trying to determine whether this fit the mold. It didn't. Instead, it's a slowly creeping (although brief) tale of madness, death and small town prejudice told through the eyes of an introverted teenage girl who lives in a kind of fantasy world isolated with her sister and invalid uncle after someone has poisoned the rest of the family. A flashy, money-motivated cousin shows up one day and turns her strange, idyllic life upside down, ultimately leading to tragedy.
It's a compelling read told in simple, elegant prose. I definitely will read more of Jackson's work.