Why had the patients changed so dramatically? Were all these distressed young people actually best served by taking puberty blockers and cross-sex hormones? While some young people appeared to thrive after taking the blocker, many seemed to become worse. Was there enough clinical evidence to justify such profound medical interventions in the lives of young people who had so much else to contend with? This urgent, scrupulous and dramatic book explains how, in the words of some former staff, GIDS has been the site of a serious medical scandal, in which ideological concerns took priority over clinical practice. Award-winning journalist Hannah Barnes has had unprecedented access to thousands of pages of documents, including internal emails and unpublished reports, and over a hundred hours of personal testimony, to write a disturbing and gripping parable of our times.