Unforgotten

When human remains are found buried in the central reservation of the M1. Cassie and Sunny begin the task of identifying them.

The search for what happened to Hayley begins as the team travel down to Middenham to meet her family.

Cassie and Sunny begin interviewing the four male occupants of The Spinney over the millennium, who all have fairly consistent accounts of the time spent in Middenham. The rest of the Bishop Street Station team look at the timelines and leads from the original investigation.

Cassie and Sunny suspect that the men all colluded in lying about their version of events for that evening, but why? The press begin to circle as they find out that James has been questioned in connection to the Hayley Reid case.

Cassie and Sunny finally get closer to some truth about the night Hayley disappeared and the case takes a devastating turn for Cassie.

Under the glare of media spotlights, the team race to find the evidence to prove the identity of Hayley's killer.

DCI Cassie Stuart and DI Sunil 'Sunny' Khan reunite to solve another historical crime, their first since they chose to walk away from a case in which victims of child sex abuse had worked together to murder their abusers. This new investigation sees four men under scrutiny when the body of a teenage girl is found at a building site off the M1 motorway. It's revealed that she's been missing since the turn of the millennium and it's up to Cassie and Sunny to figure out whether any of the men had anything to do with her death.

The writer, director and cast discuss the background to the programme.

The writer, director and cast discuss the background to the programme.

Detailed insight into the filming of this series' opening scene.

A look at some of the locations features in the series.

How integral social media is to our lives.

The actors playing the key suspects in the series discuss their characters.