After a decomposed body is found in a freezer at a waste disposal site, West Midlands Police must identify who it is, and track down the person who concealed it.
When 32-year-old Marlene Doyle, reported missing by her mother, is found murdered in a Coventry flat, police turn to forensic evidence to identify her killer.
West Midlands Police work with ballistics experts to find out whether a man with a haul of rifles in his bedroom has used a 3D printer to make potentially deadly weapons.