Cassie and Sunny work on trying to prove a final theory into David Walker's death.Source: ITV3
Despite a tragic turn of events, Sunny and the team narrow down the suspects.
Cassie and Sunny interview two of the suspects again and get closer to the truth.
Cassie and Sunny discover Walsh was chased by all four suspects on the night in question.
Cassie and Sunny interview each of the four suspects, who all deny knowing the victim.
Cassie and Sunny identify four suspects who trained as police probationers together.
When a headless body is found on a scrap heap the team identify the victim: Matthew Walsh.
When a skeleton is unearthed, a car key is the only clue to the victim's identity.
A new discovery leaves the team shocked and devastated.
Cassie and Sunny discover that James, Tim and Chris have all lied to them.
Cassie's mistake has devastating consequences for one of the suspects.
Crime drama centred around a historical crime, unravelling secrets left buried for years.
Father Robert finds that revealing the truth has lasting repercussions.
The investigation into Jimmy's death continues as Cassie and Sunny quiz Sir Phillip Cross.
The team travel down to Middenham to meet Hayley 's family.
Cassie and Sunny work on trying to prove a final theory into David Walker's death.
Detectives Cassie and Sunny begin to find out a bit more about who David Walker was.