The internationally bestselling author of Going Dark: the secret social lives of extremists (A Telegraph Book of the Year) returns to explore why radical ideas are increasingly infiltrating politics, popular culture and our everyday lives.

Incels. Anti Vaxxers. Conspiracy theorists. Neo-Nazis. Once, these groups all belonged on the fringes of the political spectrum. Today, accelerated by a pandemic, global conflict and rapid technological change, their ideas are becoming more widespread: Q