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.
The Pawns of Null-A is also known as The Players of Null-A.
What was the Follower? Gosseyn knew the creature threatened to destroy the whole solar systems, but not even his Null-A trained brain could thwart the Follower's plans.