Almost a century after Einstein first proposed it, the full ramifications of the General Theory of Relativity are still being debated. Pedro Ferreira is Professor of Astrophysics at the University of Oxford, and his new book The Perfect Theory brings to life both the science and the scientific controversies which have surrounded the General Theory since its conception. Pedro will be in conversation with Marcus du Sautoy, who has written of him ‘You couldn’t ask for a better guide to the outer reaches of the universe and the inner workings of the minds of those who’ve navigated it.’