| Monica |
Ansari | A biochemist. |
| Enid |
Blyton | A novelist. |
| Clive |
Brown | A reporter from Daily Record. |
| Nigel |
Buchanan | Kit's client. |
| Nigel |
Buchanan | The man who approached Kit. A professional thief. |
| Jenny |
Crawford | A young laboratory technician. |
| Willie |
Crawford | Hamish's colleague. |
| Cynthia |
Creighton | The company's public relations officer. |
| Odette |
Cressy | A detective. Tom's friend. |
| James |
Elliott | Director of Human Resources. |
| Antonia |
Gallo | The facilities director at Oxenford Medical. |
| Antonio |
Gallo | Toni's father. |
| Kathleen |
Gallo | Toni's mother. |
| Bonnie |
Grant | Tom's old friend. |
| Frank |
Hackett | A detecitve. Toni's ex-boyfriend. |
| Adam |
Hallan | A London banker. |
| Ned |
Handley | Miranda's fiance. |
| Sophie |
Handley | Ned's daughter. |
| Jim |
Kincaid | A superintendent responsible for CBRN. |
| Susan |
Mackintosh | One of her security guards. |
| Laurence |
Mahoney | The man from the US embassy. |
| Edie |
McAllan | A science correspondent. |
| Howard |
McAlpine | The laboratory director. |
| Diana |
McGarry | Harry's daughter. |
| Harry |
McGarry | An illegal casino owner. AKA: Harry Mac. |
| Hamish |
McKinnon | One of the security guards. |
| Carl |
Osborne | A studio anchor. |
| Kit |
Oxenford | Stanley's son. |
| Marta |
Oxenford | Stanley's wife. |
| Miranda |
Oxenford | Stanley's daughter. |
| Olga |
Oxenford | Miranda's sister. |
| Stanley |
Oxenford | Toni's boss. |
| Tom |
Oxenford | Miranda's son. |
| David |
Reid | The police constable. |
| Michael |
Ross | A lab technician. |
| Ruth |
Solomons | A doctor. |
| Ronnie |
Sutherland | Head of security for Oxenford Medical. |
| Steve |
Tremlett | The security guard supervisor. |
| Steven |
Tremlett | Securit guard supervisor at Oxenford Medical. |
| Bella |
| Toni's sister. |
| Bernie |
| A hairdresser. Bella's husband. |
| Caroline |
| Hugo and Olga's children. |
| Charles |
| One of Toni's friends. |
| Daisy |
| Nigel's sidekick. |
| Damien |
| One of Toni's friends. |
| Don |
| One of the guards. |
| Dorothy |
| Stanley's secretary. |
| Elton |
| Nigel's sidekick. |
| Fluffy |
| The Hamster. |
| Hugo |
| Olga's husband. |
| Jack |
| Frank's brother-in-law. |
| Jasper |
| Miranda's fiance. |
| Jennifer |
| Ned's ex-wife. |
| Leonard |
| Caroline's rat. |
| Lori |
| Stanley's housekeeper. |
| Lori |
| Luke's wife. |
| Luke |
| The Handyman. |
| Maureen |
| One of Kit's girls. |
| Nellie |
| Oxenford's dog. |
| Stu |
| One of the guards. |