Episode list

Trainee social worker Janet Leach is asked by the Gloucester Police to be the Appropriate Adult and sit in on the interrogation of a simple-minded suspect who may not have a full grasp of the law. Fred West, along with his wife Rosemary, is accused of killing their daughter and burying her in the garden of their house at 25 Cromwell Street. West claims that the death was an accident, and that Rosemary is innocent. However, the true grisly details gradually come to light, and West owns up to the murders of nine other girls who stayed at their house. Janet soon finds herself intimidated by the intensity of the situation, including the gutter press overtures, and her bipolar husband succumbs to these overtures and the foul-mouthed threats of Rosemary West. Just as disturbing is the rapport that Fred West believes he has with Leach - telling her that she is his only friend and relating things to her that he has not told the police.

Continuing to sit in on the police interviews, Janet is shocked when she learns of the Wests' sexual depravity and when Fred calls her Anna, one of his victims whom Leach physically resembles. With both the Wests charged, she is no longer needed, but she visits Fred in prison privately in the hopes that he will disclose the fates of more victims to her. When he kills himself, the police need Janet to tell them what he revealed to her in order to convict Rosemary, and Leach comes to see how he used her. At Rosemary West's trial, Janet's evidence helps secure a conviction, though an end title suggests that the corpses of other West victims have yet to be unearthed.