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I also enjoyed the TV series equally.

It diverges much from the book but it's enjoyable and terrifying at some points. I just really don't like ending - it felt rushed and way too open like they'd still had hopes for another series.

Personally I'd kept Dick's basis of this series and incorporate Robert Harris "Fatherland" novel that would set action for a longer while in Europe. It easily could provide action for at least 2 more seasons.

It's a great book. Phillip K Dick, there is no author like him.

It's a fantastic book, highly recommend to read.

There is also a TV series based on it (on Amazon Prime I think), but as usually, it's not as good as the book.