Season 4 Episode
- Season 4 The Murder of Sarah Payne: Fields of Evidence
- Season 4 The Body in the Suitcase
- Season 4 The Wheelie Bin Killer
- Season 4 Cracking the Killer's Code
- Season 4 Catching a Cold Case Killer
- Season 4 Murderers, Messages and the Breakfast Killer
- Season 4 The Boy in the Woods - The Murder of Rikki Neave
- Season 4 Beneath the Ashes
- Season 4 Lured to the Woods
- Season 4 The Shooting of Olivia Pratt-Korbel
- Season 4 Blood on the Carpet
- Season 4 The Rachel Nickell Murder: Justice at Last
- Season 4 Unearthing the Truth
- Season 4 Blood on His Hands
- Season 4 Buried Secrets
Expert Witness - Season 4 Episode 4 Cracking the Killer's Code
5.00 29 minutes When a violent gang use a secret language to discuss a fatal attack, police turn to a forensic linguist to crack their code. And one of the biggest cannabis growing operations ever seen in the UK is brought down with the help of a drugs expert.
