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.
Encountering a fireball which turns out to be a crossing point between
their world and another one on a different probability track, two boys,
one English and one American, face Indians, Vikings and Aztecs in their
attempts to reach California.