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Unforgotten - Episode Guide

Season 1

Episode 1

Episode: 1x01 | Airdate: Oct 8, 2015 (60 min)

Episode 1

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.

Episode 2

Episode: 1x02 | Airdate: Oct 15, 2015 (45 min)

Episode 2

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?

Episode 3

Episode: 1x03 | Airdate: Oct 22, 2015 (45 min)

Episode 3

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?

Episode 4

Episode: 1x04 | Airdate: Oct 29, 2015 (45 min)

Episode 4

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.

Episode 5

Episode: 1x05 | Airdate: Nov 5, 2015 (45 min)

Episode 5

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.

Episode 6

Episode: 1x06 | Airdate: Nov 12, 2015 (45 min)

Episode 6

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.

Season 2

Episode 1

Episode: 2x01 | Airdate: Jan 5, 2017 (60 min)

Episode 1

The new series starts with the discovery of body found in a sealed suitcase in the silt of the River Lea. With the body preserved but clearly having been there a number of years, DCI Cassie Stuart and DI Sunny Khan begin the complicated task of identifying the victim and investigating his murder.

With an expensive watch found on the body the only evidence to go on, the item is sent to forensics who suggest approaching a watchmaker who may have repaired it to find out more about its owner.

Meanwhile, we meet four seemingly un-connected suspects who may have a link to the victim – DI Tessa Nixon who is struggling with her loner son, nurse Marion Kelsey who works with chronically ill children, Brighton-based barrister Colin Osborne who is in the process of adopting a little girl with his husband, and teacher Sara Mahmoud who is interviewing for a new position in a school that needs turning around. How do any of them link to the victim, though, and why would one of them kill him?

Episode 2

Episode: 2x02 | Airdate: Jan 12, 2017 (60 min)

Episode 2

Detectives Cassie and Sunny begin to find out a bit more about who David Walker was through speaking to his ex-wife Tessa.

Episode 3

Episode: 2x03 | Airdate: Jan 19, 2017 (60 min)

Episode 3

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.

Episode 4

Episode: 2x04 | Airdate: Jan 26, 2017 (60 min)

Episode 4

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.

Episode 5

Episode: 2x05 | Airdate: Feb 2, 2017 (60 min)

Episode 5

In the penultimate episode of the series, Cassie turns her attention to investigating the goings-on at the Brentford house and the theory that one or more of the suspects may have been abused at the gatherings that took place there.

Episode 6

Episode: 2x06 | Airdate: Feb 9, 2017 (60 min)

Episode 6

With each of the suspects having a motive, opportunity or connection to victim, David Walker, Cassie and Sunny try to join the dots to discover who actually killed him 25 years earlier.

Season 3

Episode 1

Episode: 3x01 | Airdate: Jul 15, 2018 (60 min)

Episode 1

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

Episode 2

Episode: 3x02 | Airdate: Jul 22, 2018 (60 min)

Episode 2

Cassie, Sunny and the team travel to Middenham to meet Hayley's parents and twin sister, Jessica. The press are already circling in the area and it's clear that unearthing Hayley's body will bring the whole investigation back into the media spotlight.

Episode 3

Episode: 3x03 | Airdate: Jul 29, 2018 (60 min)

No image (yet).

Peter, Chris, James and Tim are all interviewed by Cassie and Sunny about the time they spent renting a holiday cottage near where Hayley disappeared over the turn of the millennium. James is the first to be called in, and reveals that Tim and Chris both had their families with them at the time. He recalls seeing press coverage of Hayley's disappearance, but never having seen her in person. Meanwhile, Chris is looking at flats with Jamila, who resolves that she needs to know everything about his past before she will take their relationship further.

Episode 4

Episode: 3x04 | Airdate: Aug 5, 2018 (60 min)

Episode 4

It becomes clear that the four male suspects have colluded in lying about their version of events on the night Hayley went missing. Jake speaks to Tim Finch's ex-wife to hear her version of events and the team uncover some disturbing information about Chris Lowe's past. Meanwhile, Sunny's ex-wife makes advances towards him and Cassie is becoming increasingly worried about her dad's memory loss.

Episode 5

Episode: 3x05 | Airdate: Aug 12, 2018 (65 min)

Episode 5

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 accidentally killed Hayley whilst driving erratically. Meanwhile, Fran thinks she has cracked a code in Hayley's diary.

Episode 6

Episode: 3x06 | Airdate: Aug 19, 2018 (60 min)

Episode 6

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

Season 4

Episode 1

Episode: 4x01 | Airdate: Feb 22, 2021 (60 min)

Episode 1

When a headless and handless body is found in a North London scrapyard, the team led by Sunny are called to investigate. They suspect the body was illegally dumped, perhaps transported inside a white goods item. This is confirmed when pathologist Leanne Balcombe finds that the dismembered corpse had been frozen. The body is identified as one Matthew Walsh who went missing 30 years before and we start to meet four people who may be connected with his disappearance.

Episode 2

Episode: 4x02 | Airdate: Mar 1, 2021 (60 min)

Episode 2

Cassie and Sunny identify four suspects who trained as police probationers together; two of them are still serving police officers.

Episode 3

Episode: 4x03 | Airdate: Mar 9, 2021 (60 min)

Episode 3

Andrews is still unconvinced that there is enough evidence to tie four police officers to the Walsh murder.  But with Fogerty dead, Cassie believes the only way to determine the truth is to interview the passengers of his car on the night in question.

Episode 4

Episode: 4x04 | Airdate: Mar 15, 2021 (60 min)

Episode 4

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.

Episode 5

Episode: 4x05 | Airdate: Mar 22, 2021 (60 min)

Episode 5

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.

Episode 6

Episode: 4x06 | Airdate: Mar 29, 2021 (60 min)

Episode 6

Despite a tragic turn of events, Sunny and the team narrow down the suspects. Will they find conclusive proof of who the murder weapon belonged to?

Season 5

Episode 1

Episode: 5x01 | Airdate: Feb 27, 2023 (46 min)

Episode 1

When a severed leg is discovered inside a chimney the team get to work identifying the victim. Cassie's replacement has a rocky start as she clashes with a grieving Sunny.

Episode 2

Episode: 5x02 | Airdate: Feb 27, 2023 (46 min)

Episode 2

The team work to identify the body found in the chimney flue as forensics reveal the cause of death. Jess and Sunny visit the victim's mother to break the devastating news. They find the pair had a tumultuous relationship.

Episode 3

Episode: 5x03 | Airdate: Feb 27, 2023 (46 min)

Episode 3

The victim's turbulent past comes to light. While Sunny takes a trip to Paris and Jess drops in on an unsuspecting Lord, the pair continue to butt heads.

Episode 4

Episode: 5x04 | Airdate: Feb 27, 2023 (46 min)

Episode 4

Sunny and Jess's personal lives go from bad to worse while they struggle to keep focused. Meanwhile, the suspect list grows and a mother and son are put under the microscope.

Episode 5

Episode: 5x05 | Airdate: Feb 27, 2023 (46 min)

Episode 5

Despite the trouble in their personal lives, Sunny and Jess attempt a reset as they follow the clues in the case.

Episode 6

Episode: 5x06 | Airdate: Feb 27, 2023 (47 min)

Episode 6

Can Sunny, Jess and the team bring the clues in the case together and unravel the secrets to solve it?

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