By 1950, an estimated 50,000 people had been deemed ‘defective’ by the government and detained for life under the 1913 Mental Deficiency Act. Their ‘crimes’ were various: women with children born outside of wedlock; rebellious teenagers caught shoplifting; those with learning disabilities, speech impediments and chronic illnesses who had struggled in school; and, of course, those who were simply ‘different’. Forcibly removed from their families and confined to a shadow world of specialist facilities in the countryside, they were hidden away and forgotten about – out of sight, out of mind. Through painstaking archival research, award-winning historian Sarah Wise pieces together the lives irrevocably changed by this devastating legislation and provides a compelling study of how early twentieth-century attitudes to class, gender and disability resulted in a nationwide scandal.