What makes an extremist? From obscure cults to revolutionary movements, people have always been seduced by fringe beliefs. And in today's deeply divided world, more people than ever are drawn to polarising ideologies. All too often we simply condemn those whose positions offend us, instead of trying to understand what draws people to the far edges of society - and what can pull them back again. In this book, we meet eight people from across religious, ideological, and national divides who found themselves drawn to radical beliefs, including a young man who became the face of white supremacy in Trump-era America, a Norwegian woman sucked into a revolutionary conspiracy in the 1980s, a schoolboy who left Britain to fight in Syria, and an Australian from the far-left Antifa movement.