20x04 Discovery, Part Two
First Aired: Jan. 10, 2017 on BBC One
Summary: In order to discover the truth between these two cases, Nikki visits disgraced pathologist Mike Liston, convicted of falsifying pathology reports, to find the truth about a cold case that holds the key to the mystery in the form of a 20 year-old DNA profile. Thomas uncovers the bizarre…
- Goof (errors in geography): A car is described as have been seen "on the A34 in Surrey". The A34 goes between Winchester and Bicester and does not pass into or near the county of Surrey.