I just started reading it so please don't spoil! I just wanna know if the book and/or its story is finished. I have presumed it's finished because it was first published back in the 1960's, but I have come across some reviews that indicate the book is not finished, also the wiki page says that the author was trying to write a sequel but eventually didn't. So before seriously driving into the book, I would like to know if the book is finished or not. By "finished" my bottom line is that I don't want to experience an unsettled feeling after reading the book.
Borrowing from my answer on another SE ... the novel ends with
Nobusuke Tagomi coming back to his own timeline, ordering Frank Frink released, then having a heart attack.
However, it also lacks a complete resolution: Philip K Dick always planned to go back to it and write a sequel some day. From this interview with the author (emphasis mine):
But then when it came time to close down the novel the I Ching had no more to say. And so there’s no real ending on it. I like to regard it as an open ending. It will segue into a sequel sometime.
And that’s why I’ve never written a sequel to it. Because it’s too horrible. It’s too awful. I started several times to write a sequel to it and I would had to go back and read about Nazis again. And I’d just like to off every one of them, it’s what I’d like to do. And so I could never do a sequel to it. Somebody would have to come in and help me do a sequel to it.