Political philosopher Jan-Werner Muller, author of the widely acclaimed What Is Populism?, takes us back to basics. In this short, elegant volume, he explains how democracy is founded on three vital principles: liberty, equality, and also uncertainty. The latter, he argues, is crucial for ensuring democracy's dynamic and creative character. Authoritarians, as well as Big Tech, seek to render politics (and individual citizens) predictable; democracy holds open the possibility that new ideas, movements and identities can be created. Acknowledging fully the dangers posed by populism, by kleptocratic autocracies like Russia's and by the digital authoritarianism of Xi, Muller also challenges the assumptions made by many liberals defending democracy in recent years. He shows how the secession of plutocratic elites in the West has undermined much of democracy's promise. In response, we need to re-invigorate our institutions, especially political parties and professional media, but also make it easier for citizens to mobilize. Taking on many of the most difficult political questions we face, this book is a vital rethinking of what democracy is, and how we can reinvent our social contract.