Good fiction must be entertaining, but what makes fiction special - and True - is that the realness of a novel allows it to carry a larger message.
I'd studied 16th century science and magic. I thought it was strange that people were interested in the same kinds of things my research was about. The more I thought about it, the more intriguing it became and pretty soon I was writing a novel about a reluctant witch and a 1500-year-old vampire.