Glebe House is a specialist residential therapeutic community for adolescent males who display harmful sexual behaviour. This chapter provides an overview of the history and theoretical underpinnings of therapeutic communities, focusing on the Glebe House model. It then explores the impact of trauma and disrupted attachment on the development of harmful sexual behaviour. The therapeutic community model can be a useful approach to respond to complex trauma and associated behaviours. This chapter explores some of the key ways in which Glebe House addresses these issues, considering relationships, emotional regulation, power and control, learning normative social behaviour and considering development into adulthood and transition into the wider community. The chapter concludes by exploring the effectiveness of the Therapeutic Community approach.