Unforgotten returns to ITV tonight with series 3 for 2018 - here's all you need to know.
Created and written by screenwriter Chris Lang (Innocent, Dark Heart), the critically-acclaimed drama is back for a brand new six-part series.
But who's on the cast and what's season 3 all about?
In season 3 of Unforgotten, when the body of a teenage girl who went missing at the turn of the millennium is found at a building site off the M1 motorway, four men are placed under the spotlight and their relationships are tested to the limit.
Set across the south of England in locations including Norfolk, West Sussex, Bristol, Hampshire and London, the new series will explore how everyday lives can be fractured and destroyed by one event, showing that appearances can often be deceiving.
The new series sees BAFTA nominees Nicola Walker (Last Tango In Halifax) and Sanjeev Bhaskar (Goodness Gracious Me) reprise their roles as DCI Cassie Stuart and DI Sunil ‘Sunny’ Khan as they investigate another emotionally-charged cold case.
The pair will be joined for the series by acclaimed actors Alex Jennings (A Very English Scandal, The Crown) Kevin R McNally (Pirates Of The Caribbean, Designated Survivor), Neil Morrissey (Line Of Duty, The Good Karma Hospital) and James Fleet (Indian Summers, The Vicar Of Dibley) who play a close-knit group of old school friends that have stood by one another through thick and thin.
In the first episode, when human remains are found on the central reservation of the M1, Cassie and Sunny are called to the scene.
Through the a mental plate found in the arm, which they determine was made in Cyprus, the team manage to roughly date the body which appears to be that of a teenage girl. Trawling through the files of girls who went missing during the time frame, their search leads them to Hayley Reid, a 16-year-old who went missing on the eve of the millennium.
With the original case having attracted a lot of media attention and the police never finding out what happened to her, the team must uncover who murdered Hayley.
Meanwhile, we met four men who have been friends since school: Local GP Dr Tim Finch in Hampshire, TV presenter James Hollis in London, failing salesman Pete Carr in Norfolk and artist Chris Lowe in Bristol.
They were occupants of rental house The Spinney over the millennium when Hayley went missing.
In tonight's fifth episode, Cassie and Sunny call James, Tim and Chris back for further questioning following the revelation that they have all lied about their whereabouts on the night of Hayley’s disappearance.
With Pete having said he saw Eliot climbing back into the holiday home through the window in the early hours of New Year’s Day, the focus is on James as Cassie and Sunny suspect his son may have accidently killed Hayley whilst driving erratically. James protests that Eliot would never hurt a fly.
Meanwhile, Fran thinks she has cracked a code in Hayley’s diary which refers to sex and drugs, indicating that Hayley travelled to the party via a local drug dealer on the night she went missing.
Unforgotten airs on ITV on Sunday nights at 9PM.