| Pro | Bethany | Waites | A T.V. reporter. Murdered. |
| | Mike | Waghorn | Bethany's friend. A T.V. reporter/journalist. |
| | | | Part 1 |
| 1 | Ron | Ritchie | A Thursday Club member. |
| | Ibrahim | Arif | A Thursday Club member. A psychiatrist. |
| | Pauline | Jenkins | Ron's make-up artist. |
| | Joyce | Meadowcroft | A former nurse. A Thursday Murder Club member. |
| | Elizabeth | Best | Former spy. The founder of Thursday Murder Club. |
| 2 | Connie | Johnson | The woman who plans to kill Bogdan and Ron. A drug dealer. |
| | Bogdan | Jankowski | Elizabeth's friend. Donna's lover. |
| 3 | Alan | | Joyce's new dog. |
| | Amber | | Mike's co-host. |
| 4 | Donna | De Freitas | The police constable. |
| | Carl | | Donna's ex-boyfriend. |
| 5 | Fiona | Clemence | Mike's former co-host. |
| | Heather | Garbutt | A member of the VAT fraud. |
| | Jack | Mason | A local crook. Heather's boss. |
| | Gerry | Meadowcroft | Joyce's dead husband. |
| 6 | Stephen | | Elizabeth's husband. |
| | Joanna | Meadowcroft | Joyce's daughter. |
| 7 | Chris | Hudson | The detective chief inspector. Donna's partner. |
| | Patrice | De Freitas | Donna's mother. |
| | Andrew | Everton | The chief constable of Kent. |
| 8 | Daisy | | Stephen's acquaintance. |
| | Brian | | Daisy's husband. |
| | Edward | | Daisy's lover. |
| 9 | Viktor | Illyich | The former KGB head of station in Leningrad. The owner of the diamond that Elizabeth stole. |
| | The | Viking | Antagonist. The money launderer. Aka: Henrik Mikael Hansen. |
| | Martin | Lomax | A well-known banker for international criminals. |
| 16 | Jonathon | Edwards | The prison guard. |
| 18 | Terry | Hallet | A detective inspector. Chris's colleague. |
| | | | Part 2 |
| 20 | Dale | | The boy who called Viktor. |
| 22 | Carron | Whitehead | The name of the account where the stolen money goes. |
| | Robert | Brown MSC | The name of the account where the stolen money goes. |
| | Cornelius | | Joanna's colleague. |
| 24 | Danny | Duff | Jason's boxing pal. |
| | Lenny | | Jack's brother. |
| 25 | Marjory | | The woman who was introduced to Andrew. |
| | Catherine | Howard | The chief constable. |
| 29 | Len | | The man Chris interviewed. |
| 30 | Minty | | Gerry's friend. A
tattoo artist. |
| | Clive | | Pauline's husband. |
| 35 | Carwyn | Price | The producer. |
| 40 | Susie | | Ron and Pauline's spa guide. |
| | Ricardo | | A masseuse. |
| | Anton | | A masseuse. |
| 43 | Kendrick | | Ron's grandson. |
| | Suzi | | Ron's daughter. |
| 46 | Scott | | The football chairman. |
| 49 | Beryl | Deepdene | Cover name of a British operative in Moscow. |
| 50 | Mr. | Nowak | Bogdan's former teacher. |
| | Bill | Chivers | Stephen's friend. A book dealer. |
| 52 | Kuldesh | Sharma | The owner of Kemptown Curious shop. |
| | Prisha | Sharma | Kuldesh's wife. |
| 66 | Michael | Gullis | The director of Absolute Dynamite. |
| 68 | Luke | | Fiona's Instagram adviser. |
| | | | Part 3 |
| 70 | Mervyn | | The new resident in Elizabeth's village. |
| | Rosie | | Mervyn's dog. |
| 78 | Yuri | | The Viking's associate. |
