At the end of the novel The Man in the High Castle,
Nobusuke Tagomi comes back to his own timeline, orders Frank Frink released, then has a heart attack.
However, the novel also lacks a complete resolution: Philip K Dick always planned to go back to it and write a sequel some day. From this interview (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. Someone who had the stomach for the stamina to think along those lines, to get into the head
For a longer discussion of the difference between the original novel and Amazon's version, see here.