Ruth Rendell

My mother was a Swede who grew up in Denmark. When I go there, I visit the street where she grew up and look at her house, which is still there, and the snowberry bush, from which she ate some berries and had to have her stomach pumped.

I have an idea, and I have a perpetrator, and I write the book along those lines, and when I get to the last chapter, I change the perpetrator so that if I can deceive myself, I can deceive the reader.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.