A small book with great weight and urgency to it, this is both a history of democracy and a clarion call for change. "Without drastic adjustment, this system cannot last much longer," writes Van Reybrouck, regarded today as one of Europe's most astute thinkers. "If you look at the decline in voter turnout and party membership, and at the way politicians are held in contempt, if you look at how difficult it is to form governments, how...