Speculative fiction is a term, attributed to Robert Heinlein in 1941, that has come to be used to collectively describe works in the genres of Science Fiction, Fantasy, and Horror.
If we define S.F as one genre, on the other hand ‘Speculative fiction’ addresses fiction that includes Weird Tales, Amazing Stories, and Fantastic Fiction. It also may include other genres, such as Mysteries, Alternate Histories, and Historical Fiction. Speculative fiction can be a collective term to describe works of science fiction, fantasy, and horror and also addresses works that are not science fiction, fantasy, or horror, yet don't rightly belong to the other genres. Speculative fiction is also more than the collective title for works of horror, science fiction, and fantasy. The term also embraces works that don't fit neatly into the separate genres
Brown(2001) identify central them of the man in the high castle
Brown(2001) defined P.D.K’s concept and concern as Dick used the “popular leitmotifs of SF” – Alien worlds, precognition, ray-guns but employed them to his own agenda. Dick used SF to explore his obsession with metaphysics, the nature of perceived reality, good and evil, and the abuse of power. He was obsessed with the idea that the universe was only apparently real, an illusion behind which the truth might dwell. We find that reality as perceived by both reader and protagonist is a hoax, a shadow-play conceived by malign forces. What constitutes a true human being, as opposed to a fake was a question that Dick had. Dick built characters drawn from real life and versions of himself. Also Brown(2001) stated that the strengths of his work was that he wrote about ordinary people in extraordinary circumstances.


