Season 4 - Episode Guide

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.

When a man confesses to killing his flatmate in self-defence, the police and forensic officers must investigate whether the victim was actually killed in cold blood.