In the Autumn of 1991, a group of young social work students meet at university in Cardiff, each filled with positivity and ambition. With a backdrop of widespread sexual abuse in Cleveland, Rochdale and Orkney, public perception of social workers is deeply cynical and the profession is already defined by negative media reporting. But this does not dampen their spirits. Tara is a headstrong pragmatist, a single mother raised in the South Wales Valleys and of Irish lineage. Proud and fiercely independent, she approaches life without fear, bolstered by a secure and loving relationship with her family. Alison is a beautiful but fragile young woman, a gifted musician who is haunted by her parents' toxic and destructive relationship. As a means of escape, Alison moves to live with her beloved Aunt Clem in rural West Wales and finds an unexpected purpose to her life. Neither Tara nor Alison have ever enjoyed an enduring female friendship before. But when their paths cross, a special bond is formed. Over the course of twenty-five years, the lives of Tara and Alison become cruelly enmeshed by events beyond their control. Despite their devotion to one another, nothing can prevent the terrible unravelling that is about to take place.