This is one of the rare cases where I saw the movie before reading the novel. Thankfully, the movie didn't take anything away from the experience of the book. Set in dystopian LA, this is a cautionary tale about addiction and the various worlds drug abusers inhabit, overlap and live in conflict with. If you've ever personally had a glimpse of these worlds then you'll recognize this was written by a man who knew. I loved this story and even if I didn't, it'd be hard to understate PKD's influence on modern science fiction. His tales are worth your reading time.