When do we become adults? What does it mean to grow up? And what are the experiences that propel us forward - or keep us stuck?

These are the questions that journalist Moya Sarner sets out to answer as she begins training as a psychotherapist. But as she delves further into her own mind and others', she soon realises that growing up is far from the linear process we imagine it to be. So begins a journey of discovery into what growing up really involves, and how we do it again and again throughout our lives.