| Gemma |
Adebayo | Female detective who interviewed Grace |
| Kathleen |
Artemis | Grace's grandmother |
| Jeremy |
Artemis | Grace's grandfather |
| Simon |
Artemis | Grace's millionaire father |
| Janine |
Artemis | Simon's new wife |
| Bryony |
Artemis | Simon and Janine's daughter; Grace's step-sister |
| Lee |
Artemis | Simon's brother |
| Andrew |
Artemis | Lee's son; Simon's nephew |
| Lara |
Artemis | Lee's wife |
| Greg |
Barker | Detective |
| Grace |
Bernard | Narrator and protagonist |
| Marie |
Bernard | Grace's mother |
| Lizzie |
Borden | Serial killer |
| Ted |
Bundy | Serial killer |
| Russell |
Chan | CEO of Manifest and Maintain |
| Coco |
Chanel | Fashion designer |
| Sandra |
Chrisholm | Adebayo's colleague |
| Hillary |
Clinton | Presidential candidate |
| Dr. |
Crippen | Serial killer |
| Lionel |
Ferguson | Caro's father; British Empire author |
| Dick |
Francis | Novelist |
| Christopher |
Hawthorne | Director of a fancy firm; Lottie's husband |
| Charlotte |
Hawthorne | Harry's mother. Aka: Lottie |
| Victoria |
Herbert | Grace's new lawyer |
| Jimmy |
Latimer | Grace's friend |
| John |
Latimer | Jimmy's father |
| Sophie |
Latimer | Jimmy's mother |
| Annabelle |
Latimer | Jimmy's sister |
| Graham |
Linton | Deputy CEO of Artemis Holdings |
| Mrs. |
Lyle | Lives at number 8 |
| Kelly |
McIntosh | Grace's cellmate |
| Masahiro |
Mori | Roboticist |
| Caro |
Morton | Young barrister; Jimmy's fiancée |
| Anne |
Morton | Last Foreign Secretary; Caro's mother |
| Harold |
Shipman | Serial killer |
| Kiran |
Singh | Hacker specialist |
| Edward Percy |
Smith | Man who bought Marsh Frog |
| Miss |
Tan | Amir's secretary |
| George |
Thorpe | Grace's lawyer |
| Donald |
Trump | Former U.S. President |
| Fred |
West | Serial killer |
| Alex |
| Jimmy's friend |
| Amir |
| Grace's new friend |
| Angus |
| Jimmy's dog |
| Archie |
| One of Jimmy's friends |
| Asha |
| Female officer |
| Bea |
| Marie's only real friend |
| Belle |
| Harry's sister |
| Benj |
| One of Lee's friends |
| Brian |
| Disgraced himself at recent charity auction |
| Christie |
| Grace's workmate |
| Cooper |
| One of Amir's friends |
| David |
| Grace's associate |
| Deirdre |
| Woman who taught CPR |
| Dionne |
| Lara's friend |
| Elsa |
| A therapist |
| Fatlad |
| One of Amir's friends |
| Gary |
| Website designer |
| Gavin |
| The Camp Digital guy |
| Harry |
| Grace's step-brother |
| Helene |
| Friend of Grace's mother |
| Jenny |
| Grace's workmate |
| JJ |
| One of Amir's friends |
| Lacey |
| One of Janine's employees |
| Laura |
| Archie's girlfriend |
| Linda |
| One of Roger's colleagues |
| Lucy |
| Roger's new worker |
| Lucy |
| Alex's girlfriend |
| Lynn |
| Brian's wife |
| Molly |
| Harry's sister |
| Nico |
| Kelly's friend |
| Nige |
| One of Amir's friends |
| Pete |
| Guy Grace met online. Aka: Coldstoner17 |
| Phyllis |
| One of Roger's colleagues. Aka: Phil |
| Roger |
| Man who ran the Marsh Project; Andrew's boss |
| Simone |
| One of Jimmy's ex-girlfriends |
| Stevie |
| One of Amir's friends |
| Tina |
| Grace's informant; Linton's PA |
