Margaret Atwood and Naomi Alderman share an interest in science fiction, the role of women and the power of fiction. They are in conversation with Philip Dodd as part of a week of Free Thinking broadcasts tying into this year's London Literature Festival at Southbank Centre, London and its theme of Living in Future Times.Margaret Atwood's new novel Hag-Seed is a re-imagining of Shakespeare's The Tempest. She is also being awarded this year's Pen Pinter Prize.Naomi Alderman's new novel The Power will be published at the end of October. It imagines a world where women are endowed with an automatic power to hurt.Producer: Fiona McLean