Andrew Marr talks to the Nobel Prize winning author Nadine Gordimer. In her latest book she explores the tensions at the heart of a nation struggling to define itself post-apartheid, through the lives of an interracial couple in suburban South Africa. The past and present also collide in the poet Jack Mapanje's attempt to understand why he was arrested by the Malawian secret police, and imprisoned without charge. Richard Dowden looks to the future of Africa to ask whether Chinese investment, an explosion in mobile technology and a growing middle class, means this will be Africa's decade.