What happens when a democratically elected leader evolves into an authoritarian ruler, limiting press freedom, civil liberties, and religious and ethnic tolerance? India and Turkey are two of the world's biggest democracies –multi-ethnic nations that rose from their imperial past to be founded on the values of modernity. They have fair elections, open markets, and freedom of religion. Yet this is an account of how the charismatic strongmen Narendra Modi, in India, and Recep Tyyip Erdogan,...