Philip K. Dick's The Man in the High Castle is a well-known alt-history novel about a post-war United States divided between the victorious Nazi German Reich and Imperial Japan's Pacific empire. It follows a number of characters in the areas of California and Colorado as they go about their daily life and participate in the larger political struggles of the day. Eastern philosophy themes underlie the text, with the I Ching in particular used to examine various issues such as fate and historicity. This is used to examine the construction of the alternate history in the book, contrasted with the in-universe novel The Grasshopper Lies Heavy in which the Allies win, though with different results from our timeline.
To be honest, somewhat underwhelmed by the novel. The examination of themes as a whole is rather shallow, and leads to characters acting very unusually and uttering conversations that don't really happen in real life. It's as if Mr. Dick can't decide whether to tell us this is a viable alternative timeline or a mere work of fiction. The world-building leaves much to be desired. The Reich is this hyper-efficient, ultra-advanced world superpower that's exploring the inner solar system in the freaking 1960s, something which is probably mocked on places like /r/[Swill]WehraboosSay. At least Wolfenstein: the New Order had the excuse of ancient Jewish caches of high technology. The Japanese empire is portrayed as a pan-Asian culture for some reason, promoting the literature of the slaves of the Ming. There's a hint of an excuse with a portrayal of a younger Japanese couple with a more tolerant outlook. The novel crams most of the action near the end, and ends without any decisive change in the main plot and several subplots left hanging. I suppose I shouldn't have been surprised, since all I've heard of Castle is its alt-history premise and little else.
Worth reading once, I suppose. Now I know where the Soviet Cold War campaign of Rise of Nations: Thrones and Patriots got the name Operation Lowenzahn from.