Trevor McDonald presents the story of how Brighton police brought a child killer to justice 32 years after the 1986 murders of two nine-year-old girls. The documentary uses testimony from one of the families and officers, as well as police footage, to follow the investigation, starting with Karen Hadaway and Nicola Fellows being reported missing, the discovery of their bodies and the arrest and failed first prosecution of Russell Bishop. The families demanded the case be reopened, while the police were frustrated they had let a killer go free. But it was only when further evidence came to light that he could be brought back to justice.