Filming has started on the fourth series of Unforgotten with Nicola Walker and Sanjeev Bhaskar.
The award-winning drama will return to ITV with a new six-part series which charts a fresh investigation into another emotionally-charged cold case murder.
BAFTA nominated actors Nicola Walker (Last Tango In Halifax, The Split) and Sanjeev Bhaskar (Yesterday, Goodness Gracious Me) reprise their roles as DCI Cassie Stuart and DI Sunny Khan for series 4.
The main cast will be joined by Sheila Hancock (New Tricks, Delicious), Susan Lynch (Killing Eve, Apple Tree Yard), Phaldut Sharma (Hanna, EastEnders), Liz White (Life On Mars, Ackley Bridge), Andy Nyman (Wanderlust, Peaky Blinders), Clare Calbraith (Baptiste, Little Boy Blue) and Lucy Speed (Marcella, National Treasure).
Returning to the cast are Peter Egan (Downton Abbey, Hold The Sunset), Alastair Mackenzie (Deep Water, Cold Feet), Carolina Main (Blood, Grantchester), Lewis Reeves (Uncle, Inspector George Gently) and Jordan Long (Prime Suspect 1973, SS-GB).
The fourth series opens with the discovery of a dismembered body in a scrap metal yard, which the team believe has been stored in a domestic freezer for thirty years. A unique Millwall Football Club tattoo leads to the victim being identified as Matthew Walsh, a young man in his mid-twenties who went missing in March 1990.
A full synopsis of Series 4 reveals: "The team quickly track the purchase of the freezer to Robert Fogerty, but they are disappointed to learn he’s recently died a lonely, broken man. On looking further into his past, they discover a drink driving conviction on the same night their victim, Matthew Walsh, went missing, and intriguingly there were four passengers in the car with him at the time.
"As the investigation progresses, we are introduced to Ram Sidhu and his wife Anna who are expecting their first baby together in London; Liz Baildon and her fiancée Janet who live in Cambridge; Fiona Grayson, her partner Geoff and their children in the Peak District; and Dean Barton and his wife Marnie who live in Rochester with their disabled son, Jack, and his younger sibling, Casper.
"All in their late forties, they appear to be in a good place, but the investigation has the potential to shatter their reputations, family relationships and the lives they’ve built over the last 30 years.
"Meanwhile, after making the decision to retire from the police force for her own sanity and wellbeing, Cassie faces an impossible dilemma when she learns she isn’t entitled to her full pension payment unless she completes her thirty years of service. Disappointed and angry with her superiors and the system, Cassie has to make the gut-wrenching decision to return to work.
"Whilst her relationship with John is going strong, she also faces difficult times with both her son, who has moved back home, and her father, Martin, who is struggling with early dementia."
Writer Chris Lang said: “I am so excited to be bringing back the Unforgotten team for a fourth series, as Cassie and Sunny take on perhaps their most challenging case to date.
"Once again, we have assembled an astonishing cast, and I cannot wait to see how the very finest actors of their generation, start bringing my characters to life.”
Unforgotten series 4 will air on ITV.