Speculative fiction is a broad umbrella category of narrative fiction referring to any fiction story that includes elements, settings and characters whose features are created out of imagination and speculation rather than based on attested reality and everyday life. That encompasses the genres of science fiction, fantasy, science fantasy, horror, alternative history, and magic realism.
Surviving a deadly experiment in time-travel, the Once and Future War
Duke of the Britons takes up his new role as a miliary consultant to
the galactic overlords, but his optimistic predictions are shadowed by
a threat to the king.