Psychotherapist Heather Delaney is shocked by the death of a client, Phoebe, with whom she had a special rapport. She knows it was not an accident or suicide as the police claim and is determined to find out what happened. She contacts a former colleague who is a private investigator. She also becomes involved in a relationship with the detective assigned to the case, DI John Kelly, who warns her against pursuing her own investigation.
Despite her own doubts and the warnings of others, she cannot let it go. She faces the reticence and hostility of Phoebe's family and friends, and issues from her own past. She compromises the principles and professional boundaries of her work as a therapist, as she learns to lie, scheme and manipulate.
Heather must risk her career, her happiness and her own mental health to discover the truth, and she must then weigh up who might be harmed and what she is prepared to lose.