...having said that you probably need to be a PKD fan to get into it at first. I am willing to bet more than a few people met this book first and noped out of PKD forever, which is a shame. Not the most accessible story, takes a bit of stamina, imo, but the payoff is well well worth it.
Unknown Binding, 212 pages
Published June 25, 1977 by Bantam Books.