The action moves to 1983 for the conclusion of the drama trilogy. A schoolgirl's disappearance bears striking similarities to the abduction and murder of Clare Kemplay in 1974, forcing Chief Superintendent Maurice Jobson to realise he may have helped convict the wrong man. Meanwhile, solicitor John Piggott is persuaded by the imprisoned man's mother to fight this miscarriage of justice - and soon unearths a trail of cover-ups.