TV drama telling the story of Janet Leach, whose relationship with Fred West played a key role in the capture of his wife, Rosemary West. When serial killer Fred West (Dominic West) was arrested in 1994 his fragile mental condition led him to be interviewed by the police in the company of 'appropriate adult' Janet Leach (Emily Watson). Appropriate adults are required by law to witness police interrogations of those in a vulnerable condition and are generally drawn from the surrounding community. The relationship that developed between West and Leach, in which he took her as his confidante, was to play a crucial role in the attempts of the police to link his wife, Rosemary West (Monica Dolan), to his crimes. But how will Jane cope with the consequent psychological toll?