I read this book because I'd seen a couple of episodes of the TV series. Honestly, as usual, the book is better. They took a lot of liberties with the series (only way to stretch a relatively short book that long,) and the characters are sometimes quite different.
This is classic Phillip K. Dick. Dystopian alternative future. It's very conceptual, rather than character-driven, although a couple of the characters are better developed than the rest. Worth a read, for sure.
Published Jan. 31, 1974 by Berkley.