Is absolute belief making a comeback? Recently the public has accepted unquestioningly certain political, economic, and scientific theories, and for sceptical people, this is a deeply worrying trend. Stuart Sim outlines the history of scepticism in both Western and Islamic traditions from the Enlightenment to today. He argues that we need less belief and more doubt-an engaged scepticism that replaces dogmatism. Addressing contemporary debates surrounding terrorism and fundamentalism, Sims suggests that scepticism can play a greater role in public and political life.