The BEST Episodes of Unforgotten

Every episode ever - ranked by fan votes!

Last Updated: Oct 19, 2021

Network: ITV

DCI Cassie Stuart and DI Sunny Khan work together to solve cold cases involving historic disappearances and murders. When the bones of a young man are found beneath the footings of a demolished house, an investigation begins that will unravel the lives of four people who have been waiting for this moment for nearly forty years, as they discover that the past can’t – and won’t – stay buried forever.

Watch Now
Episode 6

#1 - Episode 6

Season 2 - Episode 6 - Aired Feb 9, 2017

As each of the suspects have either a motive or a connection to David Walker, Cassie and Sunny work on trying to prove a more far-fetched theory that involves travelling across the country and delving further into the past of the suspects.

star 8.27
744 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 6

#2 - Episode 6

Season 4 - Episode 6 - Aired Mar 29, 2021

Despite a tragic turn of events, Sunny and the team narrow down the suspects.

star 8.26
288 votes
Episode 6

#3 - Episode 6

Season 3 - Episode 6 - Aired Aug 19, 2018

Following the discovery of seemingly incriminating items found at his house, Tim insists he bought them for his girls at a fete in Middenham. However, the team are not buying Tim's story. A new discovery leaves the team shocked and devastated, hitting Cassie particularly hard.

star 8.23
481 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 6

#4 - Episode 6

Season 1 - Episode 6 - Aired Nov 12, 2015

Father Robert's revelations prove to have lasting repercussions, especially for Caroline when she goes into premature labour. Bella and Josh deliberate over the best way to deal with their father, the search for Lizzie continues and Maureen is finally able to lay Jimmy to rest.

star 8.03
804 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 5

#5 - Episode 5

Season 3 - Episode 5 - Aired Aug 12, 2018

James, Tim and Chris are exposed as having lied about their whereabouts on the night Hayley died. Pete reveals that he saw Eliot climbing into the holiday home through a window on New Year's Day, while leaves James struggling with the possibility that his son may have killed Hayley. Fran cracks a code in the dead girl's diary, suggesting that she met a local drug dealer on the night she disappeared.

star 7.97
482 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 4

#6 - Episode 4

Season 4 - Episode 4 - Aired Mar 15, 2021

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

star 7.95
282 votes
Episode 5

#7 - Episode 5

Season 1 - Episode 5 - Aired Nov 5, 2015

As Cassie and Sunny continue their investigation into the cold-case murder, the net tightens around the people whose names were found in the victim's diary. Sir Phillip Cross makes a difficult decision to salvage what is left of his reputation while at the same time protecting his family, Father Robert comes clean to the police and Ray returns home to find Lizzie gone.

star 7.95
764 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 5

#8 - Episode 5

Season 4 - Episode 5 - Aired Mar 22, 2021

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.

star 7.94
281 votes
Episode 3

#9 - Episode 3

Season 4 - Episode 3 - Aired Mar 9, 2021

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

star 7.91
286 votes
Episode 4

#10 - Episode 4

Season 1 - Episode 4 - Aired Oct 29, 2015

As the investigation into the cold-case murder continues, the forensic team discovers that the marks on the victim's body are consistent with known gangland torture methods. With this in mind, Cassie and Sunny question Sir Phillip about his involvement with a prominent East End crime family 40 years ago. Did the businessman or any of the shady associates of his youth have anything to do with Jimmy's disappearance or murder? Meanwhile, Eric and Claire's anniversary gets under way.

star 7.91
793 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 4

#11 - Episode 4

Season 3 - Episode 4 - Aired Aug 5, 2018

It becomes clear to the detectives that the four men have conspired to come up with a false account of what took place the night Hayley disappeared. Jake is assigned to track down Tim Finch's ex-wife to hear her version of events - and uncovers disturbing information about Chris Lowe's past. On a personal front, Sunny is offered the opportunity to rekindle his past marriage, and Cassie worries about her father's failing memory.

star 7.89
495 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 5

#12 - Episode 5

Season 2 - Episode 5 - Aired Feb 2, 2017

Cassie begins to investigate the Brentford house and the theory that one or more of the suspects may have been abused at the gatherings that took place there. The enquiry reveals some information that allows Colin to come to terms with a shame that he has lived with for over 25 years. Sara is forced to confront her past in order to prove her innocence. Marion pushes her family even further away.

star 7.87
731 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 3

#13 - Episode 3

Season 2 - Episode 3 - Aired Jan 19, 2017

Further examination of David Walker's history suggests that he was a troubled man with a number of issues. Marion has a prickly chat with Cassie about her past and the investigation reveals her close relationship with an IRA activist. As the police enquiries encroach on their lives, Sara and Colin open up to their partners.

star 7.87
759 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 3

#14 - Episode 3

Season 3 - Episode 3 - Aired Jul 29, 2018

Cassie and Sunny begin their interviews...

star 7.82
487 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 3

#15 - Episode 3

Season 1 - Episode 3 - Aired Oct 22, 2015

Cassie and Sunny dig deeper into the lives of two of the people mentioned in the diary. They begin with Father Robert Greaves, who remembers Jimmy fondly, but is unable to help identify the mysterious 'Jo-Jo', the person who it appears gave Jimmy the journal. The detectives also meet Eric Slater, the former bookkeeper to Arlingham House. He also remembers the victim well - but can he provide any clues to his disappearance?

star 7.78
824 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 2

#16 - Episode 2

Season 3 - Episode 2 - Aired Jul 22, 2018

Cassie and Sunny go in search of Hayley's family as the press begin to take an interest in the story. A detective who was involved in the original investigation offers his thoughts on why her disappearance remained unsolved, pointing out that Hayley's boyfriend was suspected of the crime but was never charged. The distance between where Hayley was last seen and where her body was found leads Cassie to form a new theory - that the killer may have travelled up from London, then returned before they could be questioned

star 7.76
497 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 4

#17 - Episode 4

Season 2 - Episode 4 - Aired Jan 26, 2017

A disturbing allegation about David opens up a second line of enquiry for the team. How much Tessa actually knew about David's life threatens to ruin her relationship with her husband and son. Marion gets into trouble at work and jeopardises her marriage by refusing to open up about her past. After having his phone stolen and information exposed, Colin is blackmailed again - and Sarah's secrets push her family to breaking point.

star 7.74
717 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 2

#18 - Episode 2

Season 4 - Episode 2 - Aired Mar 1, 2021

Cassie and Sunny identify four potential suspects who trained as police probationers together, and two of them are still serving officers. They have no luck finding the rest of the body and decide to go public about the discovery of Walsh's remains.

star 7.73
283 votes
Episode 2

#19 - Episode 2

Season 2 - Episode 2 - Aired Jan 12, 2017

Detectives Cassie and Sunny begin to find out a bit more about who David Walker was through speaking to his ex-wife Tessa. A search through the original investigation files and numbers traced from his pager help them build a picture of David, and lead them towards potential suspects. A conversation with David's old school friend leads Cassie and Sunny to believe that they may have found a motive.

star 7.72
783 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 2

#20 - Episode 2

Season 1 - Episode 2 - Aired Oct 15, 2015

Having identified the body in the cellar as Jimmy Sullivan, Cassie visits the victim's mother, who is relieved that she might finally find out what happened to her son 39 years after he went missing. The detectives focus their investigation on the names in Jimmy's diary, who are revealed to be a government advisor, a priest, a retired bookkeeper and a housewife with a secret past. What part, if any, could these four wildly different people have played in Jimmy's disappearance and demise?

star 7.71
868 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 1

#21 - Episode 1

Season 3 - Episode 1 - Aired Jul 15, 2018

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.

star 7.70
504 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 1

#22 - Episode 1

Season 4 - Episode 1 - Aired Feb 22, 2021

A dismembered body is found in a scrapyard and the team believes the remains had been stored in a domestic freezer for 30 years. After making the decision to retire from the police force, Cassie faces a dilemma when she learns she isn't entitled to her full pension payment unless she completes her 30 years of service.

star 7.66
293 votes
Episode 1

#23 - Episode 1

Season 2 - Episode 1 - Aired Jan 5, 2017

A waterlogged suitcase holds the remains of David Walker, 25 years after he disappeared. Walker’s wife, Tessa, turns out to be a police officer. Cassie and Sunny interview two other suspects, Sara and Colin.

star 7.65
821 votes
Directors: Andy Wilson
Writers: Chris Lang
Episode 1

#24 - Episode 1

Season 1 - Episode 1 - Aired Oct 8, 2015

A skeleton found in the cellar of a building being demolished prompts investigation from DCI Cassie Stuart and her colleague DS Sunny Khan into the murder of a young man that could potentially span back thousands of years. Discovery of what they believe to be a car key near the body not only dates it to within the last 65 years, but also leads them on a trail in the hope of identifying the victim. At the end of the trail is a diary belonging to Jimmy Sullivan, a young man missing since 1976 who appears to be the victim. The final pages of the diary contain several names and addresses, amongst them are Beth, Father Rob, Frankie C and Mr. Slater. Four seemingly unconnected people living very separate lives. It is now down to Cassie and Sunny to find out what happened to Jimmy and to finally get him home.

star 7.62
963 votes
Directors: Andy Wilson
Writers: Chris Lang