Geoffrey Robertson QC joins Anne McElvoy to pay tribute to American philosopher and constitutional law expert Ronald Dworkin, who died on 14th February 2013 aged 81. We hear from award-winning author Andrew Solomon about his monumental study of modern identity - Far From the Tree. Writer and historian Joanna Bourke reviews Complicit, Channel 4's new feature-length drama, which explores an MI5 officer’s moral dilemma over the use of torture in the War on Terror. And did brutal conquest rather than political liberation lie at the heart of Italian unification? Historian Lucy Riall discusses.