Anne McElvoy talks to the French novelist Laurent Binet about his playful novel The 7th Function of Language, inspired by the death of Roland Barthes which has won the Prix de la FNAC and Prix Interallié. Emile Chabal considers what's next for France and Europe after the election of Emmanuel Macron. Plus, why blockchains, the technology underpinning cryptocurrencies such as Bitcoin, have the potential to revolutionize the world economy. Or do they? Three experts - Ajit Tripathi, Colin Platt and Izabella Kaminska - discuss.The 7th Function of Language by Laurent Binet, translated by Sam Taylor, is out now. Producer: Craig Templeton Smith.