The Man in the High Castle is… suggestive. Dick is a pre-digital master of virtual reality; or in older vernacular, alternative reality. Access to such may be acquired via narcotic means, technology or…? In High Castle, I’m not really sure.
High Castle is basically a slice of life. How would ‘modern’ (1960s) Americans live if Japan and Germany had won the Second World War? From the humdrum everyday existence up to the far-reaching context of international affairs. And what if, within this world, a small handful of people discovered an alternative? Would this alternative exist only in the mind of its imaginer? Or…?
Not to put too fine a spoiler on it, High Castle leaves you wondering. Which is Philip K Dick in a nutshell, really.