<Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 5 January 2017 (2017 - 01 - 05) </Td> <Td> 9 February 2017 (2017 - 02 - 09) </Td> <Td> 6.91 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 6 </Td> <Td_colspan="1"> 15 July 2018 (2018 - 07 - 15) </Td> <Td> 19 August 2018 (2018 - 08 - 19) </Td> <Td> TBA </Td> </Tr> <Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> UK viewers (millions) </Th> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "Episode 1" </Td> <Td> Andy Wilson </Td> <Td> Chris Lang </Td> <Td> 8 October 2015 (2015 - 10 - 08) </Td> <Td> 7.35 </Td> </Tr> <Tr> <Td_colspan="7"> A skeleton found in the cellar of a building being demolished prompts investigation from DCI Cassie Stuart and her colleague DI 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 finally to get him home . </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "Episode 2" </Td> <Td> Andy Wilson </Td> <Td> Chris Lang </Td> <Td> 15 October 2015 (2015 - 10 - 15) </Td> <Td> 6.41 </Td> </Tr> <Tr> <Td_colspan="7"> Once the body in the cellar has been identified as Jimmy Sullivan, the search for his murderer begins; Cassie and Sunny investigate, starting with identifying the names featured in Jimmy's diary . Cassie travels to Kenny to see Maureen, Jimmy's mother, to get a sense of who Jimmy was; she is met by a woman who is in fact relieved that she might finally find out what happened to her son 39 years after he went missing .' Frankie C' is identified as Sir Phillip Cross, the government's recently appointed entrepreneurial tzar, who denies ever having met Jimmy .' Beth' is identified as Lizzie Wilton, living in Croydon and married to Ray, a second - generation Jamaican man . Lizzie also denies knowing Jimmy but is clearly a very different woman from who she was in the 70s before her marriage .' Father Rob' is Robert Greaves who at the time of Jimmy's death was working in the local church to Arlingham House . And' Mr. Slater' is Eric Slater, a wheelchair user and a retired bookkeeper living with his wife Claire in Cambridgeshire . </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "Episode 3" </Td> <Td> Andy Wilson </Td> <Td> Chris Lang </Td> <Td> 22 October 2015 (2015 - 10 - 22) </Td> <Td> 6.29 </Td> </Tr> <Tr> <Td_colspan="7"> The investigation into Jimmy's death continues . Cassie and Sunny pay a visit to 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 diary . Cassie and Sunny also meet Eric Slater, a former bookkeeper to Arlingham House, who remembers Jimmy well . </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "Episode 4" </Td> <Td> Andy Wilson </Td> <Td> Chris Lang </Td> <Td> 29 October 2015 (2015 - 10 - 29) </Td> <Td> 6.61 </Td> </Tr> <Tr> <Td_colspan="7"> 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 . Ray returns home to find Lizzie gone, broken glass where a brick was thrown through a window, and a note with the word "Sorry" on it . </Td> </Tr> <Tr> <Th> 5 </Th> <Td> 5 </Td> <Td> "Episode 5" </Td> <Td> Andy Wilson </Td> <Td> Chris Lang </Td> <Td> 5 November 2015 (2015 - 11 - 05) </Td> <Td> 5.95 </Td> </Tr> <Tr> <Td_colspan="7"> Following the revelation that a second victim may be buried at the bottom of the Slaters' garden, Cassie and Sunny gatecrash their 45th anniversary party and begin searching for a second body, and it's not long before they strike gold . Eric Slater is arrested, but denies all charges made against him . After some initial reluctance, Curtis agrees to help Ray go in search of Lizzie . Father Robert confesses that he was the one who stole money from the church charity fund, and that after his secret affair with JoJo, she became pregnant and he has been using the money to pay the way for his illegitimate child . Before the news breaks of Eric Slater's arrest, Sir Phillip Cross has already struck a deal with his son's Turkish contacts, and before he is able to change his mind, the witness who came forward with evidence against him is killed in a house fire, made to look like an accident caused when the man' fell asleep smoking' . Evidence found in Eric Slater's home links him to the location of the last known whereabouts of the second victim, and following the revelation that Jimmy had been selling himself for sex as a way of repaying the debt he owed to the Fenwicks, Cassie and Sunny finally realise that the connection between both murders may be Eric Slater's hidden hatred for homosexuals . </Td> </Tr> <Tr> <Th> 6 </Th> <Td> 6 </Td> <Td> "Episode 6" </Td> <Td> Andy Wilson </Td> <Td> Chris Lang </Td> <Td> 12 November 2015 (2015 - 11 - 12) </Td> <Td> 6.01 </Td> </Tr> <Tr> <Td_colspan="7"> 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's suicide, the search for Lizzie continues and Maureen is finally able to lay Jimmy to rest, after Claire has been identified as his murderer . </Td> </Tr> </Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> UK viewers (millions) </Th> </Tr>

Who plays martin hughes girlfriend in unforgotten 2018