Olivia Harley (Valene Kane) is a successful, high-powered family law barrister in Belfast married to Sir Malcolm Harley (Declan Conlon), a prominent public figure. Professionally composed and fiercely ambitious, Olivia takes on a complex legal case representing Gareth Fleming (Adam Gillian), a young, working-class client struggling in a custody battle over his young child. As the case progresses, the professional boundary between barrister and client blurs. Drawn into an intense affair with Gareth, Olivia recklessly risks both her legal career and her marriage as her personal and professional lives implode.