This is PKD’s imagined history of what the US would be like if the Allies lost WWII. The mindset of the characters is hauntingly similar to our own, yet different. It might first seem like it is a bland, rambling story with no resolution, but there is much more here. The writing, especially the dialogue, is superb. PKD wove a great alternate reality in detail, down to creating new lingos.
The abrupt ending is somewhat maddening. It leaves you wanting a better explanation. You’ll reread the ending to see if you missed something, then think about it for days after you finish reading it. That said, each character has a complete arc, so the book is complete.
The book is different from the Amazon Original Series. The characters are mostly the same with a few notable exceptions, but their storylines are completely different. The Original Series adaptation was probably necessary to make it more engaging to watch, but the book is better sci-fi. Both are worth consuming!