The Series’ Most Dramatic Season, “Unforgotten” on MASTERPIECE, Starting July 11 at 9 pm

Posted on:

< < Back to



Premieres Sundays, July 11 – August 15, 2021, at 9:00


Nicola Walker (Last Tango in Halifax, Babylon) and Sanjeev Bhaskar (Yesterday) star as DCI Cassie Stuart and Cassie’s partner-in-solving-crime, DI Sunny Khan, who are veterans at uncovering the truth of tangled, complicated murders of the past. But the deeper the truth lies, the bigger the emotional toll for the suspects, the families left behind, and for Cassie and Sunny to handle. How long can one fight for justice while preserving their own sanity?

woman in beannie cap and coat
(C) Mainstreet Pictures LTD

In Unforgotten Season 4, the British Academy Film Awards (BAFTA) award-winning series’ most dramatic season yet, Cassie and Sunny investigate a cold case with alarming links to the police force when a corpse is discovered in a scrap yard, his features frozen in time. All four suspects have links to the law and attended the same police training course back in 1989. But who exactly is fighting for justice? Can the police force ever really be trusted? And will Cassie and Sunny find themselves on the wrong side of the law? Guest stars in Season 4 include Alastair Mackenzie (Wolf Hall), Liz White (Life on Mars), Daniel Flynn (Father Brown), and more.


Episode One
Sunday, July 11, 2021 at 9 pm

Parts of a body are found. The team believes the remains have been stored for a long time. After deciding to retire, Cassie learns she must complete 30 years of service to receive her pension.

Episode Two
Sunday, July 18, 2021 at 9 pm

two women on park bench
Shown from left to right: Fiona (LIZ WHITE) & Liz (SUSAN LYNCH)
(C) Mainstreet Pictures LTD

Cassie and Sunny identify four potential suspects who trained as police officers. They have no luck finding the rest of the body and decide to go public with the discovery of Walsh’s remains.

Episode Three
Sunday, July 25, 2021 at 9 pm

Cassie and Sunny interview the four suspects, who all deny knowing the victim. Boulting discovers Walsh was cautioned three weeks before his death, and Collier manages to locate the rest of Walsh’s body.

Episode Four
Sunday, August 1, 2021 at 9 pm

Cassie and Sunny discover Walsh was chased by all four suspects on the night in question. Willets realizes Fiona’s blood sample may have been deliberately lost by Liz. The pathologist identifies a cause of death implying Walsh was murdered.

police officer showing badge to group in the room
Shown from left to right: Jake (LEWIS REEVES) and Dean (ANDY NYMAN)
(C) Mainstreet Pictures LTD

Episode Five
Sunday, August 8, 2021 at 9 pm

Cassie and Sunny interview two of the suspects again and get closer to the truth of what happened to Walsh. Balcombe believes she may have found the cause of death. Unexpectedly, things take a devastating turn for Cassie.

Episode Six
Sunday, August 15, 2021 at 9 pm

Despite a tragic turn of events, the team narrows down the suspects. Will they find conclusive proof of who the murder weapon belonged to and succeed in bringing Walsh’s killer to justice?