Following on from the first season, grieving psychotherapist Dr Susannah Newman sets out on a quest to find the truth about her daughter Christina's tragic death. When a mysterious new client Jon makes a disturbing confession under hypnosis, Susannah is forced to embark on her own deadly mission to save a life - the way she couldn't do with her own daughter.

Susannah tracks down her ex-client, officer Louisa, who though initially hostile eventually opens up about a witness who saw her friend being killed by a man matching Jon's description. Louisa admits that she was threatened into silence and Susannah realises they might both be in imminent danger. Louisa sends Susannah a photo of the witness who she needs to find. As Susannah hurries away, it's clear that she too could now be a target.