Featuring an all star cast, this chilling psychological series enters the world of the dead to answer questions about the living. Robert Bridge (Andrew Lincoln) is a psychology lecturer, grieving the loss of his young son Josh who was killed in a car accident four years earlier. A specialist in the study of psychic mediums, Robert is invited to an evening of clairvoyance where he meets Alison Mundy (Lesley Sharp) - a far cry from the fraudulent psychics he is used to. Ever since she was a child, Alison has seen spirits and after a near death experience they have taken over her life. Now driven by a compulsion to help those around her, Alison seeks to resolve relationships torn apart by death. When Alison's readings provoke an adverse reaction in one of Robert's own pupils, he begins to study her with the intention of writing about her work and the people she helps. But their relationship is thrown into crisis when Alison reveals she is in touch with Robert's son. The series charts Robert and Alison's conflicted relationship over six separate stories, following their struggle to its thrilling climax in the final episode.