(The Man in the High Castle does have a TV series adaptation, just FYI, ha ha!)

Generally I’m a book first, movie second kind of person. I figure that way I have the same background knowledge that the filmmakers did and I can appreciate how the material is being adapted, and I dislike spoilers for my books.

But, I also don’t watch movies very often. So it’s easy for me to keep up with reading the books first. I think you just have to figure out how important it is (or if it’s important at all) for you to have read the book before watching the movie. Then either read the books first or don’t, whichever will work for you!