Declared a person of interest when a body is discovered under the floor of her home, London psychologist Frieda Klein realizes that a copycat killer is responsible before she finds herself caught between two obsessive murderers.

When the body of her ex-boyfriend turns up in the Thames, London psychotherapist Frieda Klein becomes the prime suspect in the murder investigation and goes on the run to save herself and find the real killer, who she believes is a man who has never stopped haunting her, but who the police think has been dead for years.