This documentary takes two cases, the killing of a woman in Rhineland Palatinate, Germany, and the murder of a hospital nurse in Glasgow, to demonstrate how the entomologist Jens Amendt and the forensic soil expert Lorna Dawson work.
Take a look behind the scenes of some spectacular manhunts. Scientists and experts uncover important clues to convict the perpetrators.
A weapon is found at the scene of a crime and an important question for the investigators comes to light: "Was the victim shot with this weapon?".