Andrew Marr talks to the science fiction writer China Mieville, whose latest planetary creation explores the links between language and thought, and asks what it means to have no concept of lying. AN Wilson explores a world closer to home, but no less alien, medieval Florence, as he tries to uncover the life and work of Dante. Jonathan Bates' play, Being Shakespeare also attempts to bring to life the work of the Bard and the real man behind the legend, by placing him in his historical context. And the prize-winning poet Jo Shapcott argues for the transformative nature of poetry. Producer: Katy Hickman.