Luther returns to work after a traumatic arrest to investigate the murder of a former child genius's parents, and quickly deduces that their daughter is responsible. However, unable to find evidence to convict, he becomes embroiled in a battle of wits with the suspect - who has set her sights on him and his estranged wife.
Quest roles:
Matthew Marsh(DCSU Russell Cornish), Chris Wilson(Police Officer (uncredited)), Glen Stanway(Police Constable (uncredited)), Anton Saunders(Henry Madsen)