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


  • 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.
  • Episode 3

    Cassie and Sunny interview four men while the team returns to the original investigation.
  • Episode 2

    The team travel to Middenham to meet Hayley’s family.
  • Episode 1

    Cassie and Sunny work to identify human remains found buried near a London motorway.
  • Episode 3

    Tessa, Sara, Colin, and Marion each have a motive—but also an alibi.
  • Episode 2

    The victim’s life comes into focus; it was a mess.
  • Episode 1

    A waterlogged suitcase holds the remains of David Walker, 25 years after he disappeared.

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.”