It's not very often that I binge-watch 40 hours of a TV series in two weeks, but I did that with "Man in the High Castle". It captured my attention in a very powerful way, like a memory from a past life that doesn't go away.
This was an alternate world where the Nazis and the Japanese defeated and occupied America after WW2. The actors were believeable and the plot twists were unexpected and exciting. This was a great adventure in another world that was somewhat familar to me.
Nazis have showed up in many different sci/fi stories. The first one I saw was in the original Star Trek called "City on the Edge of Forever".
The second was from the same series where the good guys became bad guys: It's called "Mirror, mirror". "High Castle" had elements of this dichotomy in the character of John Smith pictured above. He was like a soul that was split in two.
Also, there is some indication that individuals are replicated or cloned in our world or both worlds.
The ending of High Castle is easier to understand when all the information from the links above are sorted through and analysed.
Highwayman by Willie Nelson, Kris Kristofferson, Whelan Jennings and Johnny Cash.