Police officers investigate the murder of a boy whose diary implicates four couples.


  • Episode 5

    Cassie and Sunny interview two of the suspects again and get closer to the truth.
  • Episode 4

    Cassie and Sunny discover Walsh was chased by all four suspects on the night in question.
  • Episode 3

    Cassie and Sunny interview the four suspects, who all deny knowing the victim.
  • Episode 2

    Cassie and Sunny identify four potential suspects who trained as police officers together.
  • Episode 1

    After making the decision to retire from the police force, Cassie faces a dilemma.
  • Episode 6

    The team race to find evidence to prove the identity of Hayley’s killer.
  • Episode 5

    As Cassie and Sunny get closer to the truth, the case takes a devastating turn for Cassie.
  • Episode 4

    Cassie and Sunny suspect the men are lying. The press learn James has been questioned.

About Unforgotten

Nicola Walker (Last Tango in Halifax) and Sanjeev Bhaskar (Indian Summers) star as police officers investigating the cold case murder of a boy whose diary implicates four seemingly unconnected couples in a thriller that The Guardian (UK) hailed as “so much more than a satisfying murder mystery.”