'Piercingly revelatory ... a tour de force' - Carl Miller, author of The Death of the Gods

'...a must-read ' - Eliot Higgins, author of We Are Bellingcat

'A timely and frighteningly revealing book' - Richard Kerbaj, author of The Secret History of the Five Eyes

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 cult ...