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