A TELEGRAPH BOOK OF THE YEAR''Engaging and visceral ... Reads like a thriller'' Financial Times''Riveting and often deeply disturbing ... A punch to the stomach'' Sunday Times''Ebner has done some gutsy, thought-provoking research'' Sunday Telegraph''Fascinating and important'' SpectatorBy day, Julia Ebner works at a counter-extremism think tank, monitoring radical groups from the outside. But two years ago, she began to feel she was only seeing half the picture; she needed to get inside the groups to truly understand them. She decided to go undercover in her spare hours - late nights, holidays, weekends - adopting five different identities, and joining a dozen extremist groups from across the ideological spectrum. Her journey would take her from a Generation Identity global strategy meeting in a pub in Mayfair, to a Neo-Nazi Music Festival on the border of Germany and Poland. She would get relationship advice from -