| | | | Part One |
| 1 | Mervyn | Collins | Thursday Murder Club's new friend. |
| | Elizabeth | | Leader of Thursday Murder Club. |
| | Joyce | Meadowcroft | Elizabeth's colleague. |
| | Ron | Ritchie | A Thursday Murder Club member. |
| | Stephen | | Elizabeth's husband. |
| | Ibrahim | Arif | A Thursday Murder Club member. Psychiatrist. |
| | Bethany | Waites | The former case. |
| | Tatiana | | Mervyn's online girlfriend. |
| 2 | Mitch | Maxwell | A drug dealer. |
| | Scott | | Joanna's boyfriend. The football chairman. |
| | Donna | De Freitas | A policewoman. Thursday Murder Club's friend. |
| | Chris | Hudson | Donna's boss. |
| | Gerry | Meadowcroft | Joyce's late husband. |
| | Alan | | Joyce's dog. |
| | Kuldesh | Sharma | An antique shop owner. Stephen's friend. |
| 5 | Bogdan | | Donna's boyfriend. |
| 6 | Samantha | Barnes | An art forgerer. An antique dealer. |
| | William | | Samantha's colleague. |
| | Garth | | Samantha's husband. |
| 7 | Bob | Whittaker | Joyce's friend. A computer guy. |
| | Viktor | | One of Joyce's friends. A high-ranking official. |
| | Bernard | Cottle | Joyce's friend. A professor. |
| 8 | Patrice | De Freitas | Donna's mother. Chris's girlfriend. |
| | Amy | Peach | Forensic Officer. |
| 10 | Terrence | Brown | The credit card owner at Kuldesh's shop. |
| 12 | Connie | Johnson | Ibrahim's client. |
| | Louise | | The lady who runs the café. |
| | Dominic | Holt | The man who runs heroin in Newhaven. |
| 14 | Jill | Regan | The SIO Agent. |
| 15 | Nina | Mishra | A professor at Historicla Archaeology. |
| | Big | Dave | The stranger at the funeral. |
| | | | Part Two |
| 18 | Luca | Buttaci | Mitch's friend and business partner. |
| 19 | Professor | Mellor | Nina's boss. AKA: Jonjo. |
| 20 | Gill | | Samantha's friend. |
| 22 | Pauline | | Ron's girlfriend. |
| 26 | Jason | Ritchie | Ron's son. |
| 28 | Brian | Cox | A professor. |
| 31 | Edwin | Mayhem | The new man who is moving in. |
| 32 | Dave | Musgrave | A car dealer owner. |
| 35 | Anthony | | The hairdresser. |
| | Freddie | The Frog | The barber. |
| 41 | Audrey | | The woman at the television room. |
| 43 | Kasia | | A cryptographer. Elizabeth's
acquaintance. |
| 45 | Tony | Weir | Jason's opponent. |
| | Gabby | | Tony's wife. |
| | Noah | | Tony's son. |
| | Saskia | | Tony's daughter. |
| 47 | Lesley | | The woman from Fairhaven Council. |
| 49 | Sayed | | The leading drug dealer in Afghanistan. |
| | Hanif | | One of Sayed's men. |
| 55 | Jeremy | | Tatiana's friend. |
| 63 | Marianne | | The woman that Joyce met. |
| | Winifred | | The man that Joyce met. |
| | | | Part Three |
| 71 | Jonah | Lomu | A rugby union player. |
| 78 | Thomas | Murdoch | The man that Jill interviewed. |
| 83 | Caroline | | The woman who kills people for Connie. |
| 89 | Emma | | Edwin's daughter. |
