I'm not entirely sure specifically what Dreda Say Mitchell's 'Fantastic Fiction' is about as I haven't read it directly. It could potentially be about a wide range of things like fantastical adventures, magical elements, or unique characters in a fictional world.
Since I don't have in - depth knowledge of this particular 'Fantastic Fiction' by Dreda Say Mitchell, we can make some general assumptions. It might be a story that aims to transport readers to a different reality. It could be filled with vivid descriptions of fictional landscapes, from enchanted forests to bustling magical cities. The characters in it could be on a journey of self - discovery or perhaps on a quest to save their world from a great threat. There might be elements of romance or friendship that develop among the characters as they face challenges together.