Book excerpt: Renowned American sociologist Charles Derber imagines a surprise encounter with Karl Marx's ghost in London's Highgate cemetery, leading to a night-long conversation about the problems plaguing the world. The economic crisis, climate change, war, the future of capitalism and the 'Arab Spring' are all discussed. The ghost reconsiders his theories as he speaks eloquently about American labour, environmental, gender and anti-racist struggles. The engrossing, funny and provocative conversation, with appearances from other ghosts such as John Maynard Keynes, offers new insights into the relevance and flaws of Marx's thought, indicating how we can get to a better world.