You are saying this free will stuff because you are conditioned to believe in free will. Someone who knew that there was only one future would find the idea of

You are saying this free will stuff because you are conditioned to believe in free will. Someone who knew that there was only one future would find the idea of free will to be like some kind of fairy tale -- the lack of it doesn't require any more explanation than the lack of Santa Claus. In our current non-fictional universe, where we don't know if there is free will, then if you want to believe in it, maybe the burden of proof is on you to explain how it would even be possible given what we know of the universe. So I am not sure why you think a fiction author is failing at is job by not explaining the mechanism by which there is not free will.