When the body of a missing teenager is found in a field near his village, Nikki and the Lyell team must determine whether the killer is a stranger or a local.

The body of a woman is found on railway tracks in London, badly damaged from electrical burns. On the mortuary slab, the woman's recent and historic injuries suggest years of abuse, likely within the home. It's a difficult post-mortem for Nikki, as she is troubled by memories from her childhood.