| Kazia |
Bobak | One of the victims |
| Siobhan |
Brady | Peter's victim |
| Alex |
Brightwell | Peter's brother; possible identity of LoveMyBro |
| Mandy |
Brightwell | Peter's wife |
| Peter Samuel |
Brightwell | Convicted rapist |
| Russell |
Brigstocke | Detective Chief Inspector |
| Sally |
Brigstocke | Russell's wife |
| Adam |
Callaghan | Victim |
| Andre |
Campbell | Peter's cellmate |
| Dipak |
Chall | Detective Sergeant |
| Nicholas |
Cresswell | Firm owner. Aka: Nick |
| Charita |
Desai | Detective Constable |
| Charita |
Desai | Detective Sergeant |
| James |
Greaves | Detective Inspector; Walker's colleague |
| Merle |
Haggard | American singer and songwriter |
| M. |
Healey | Police constable at Callaghan's crime scene |
| Phil |
Hendricks | Thorne's friend |
| Greg |
Hobbs | Member of the Digital Forensics Unit |
| Chloe |
Holland | Dave's daughter |
| Dave |
Holland | Thorne's colleague; Detective Inspector |
| Pippa |
Holland | Dave's wife |
| Catherine |
Holloway | One of the victims |
| Chris |
Holloway | Catherine's husband |
| Sylvia |
Holloway | Catherine's mother |
| Paul |
Hopwood | Alfie's biological father; police officer |
| Asim |
Hussain | One of the victims |
| Craig |
Knowles | Rapist police officer |
| Priya |
Kulkarni | Craig's rape victim |
| Emily |
Mead | Woman who found Callaghan's body |
| Patrick |
Mead | Emily's brother |
| Stuart |
Needham | Security guard; hit-and-run victim |
| George |
Oldfield | Detective in the Yorkshire Ripper investigation |
| Stephen |
Pallister | New member of the Major Investigation Team |
| Steve |
Pallister | Police officer |
| Matt |
Parkinson | Employee at Fin-Cel |
| Daniel |
Sadler | Karen's husband; victim |
| Karen |
Sadler | Family liaison officer |
| Nathan |
Sadler | Karen's son |
| Nicola |
Tanner | Thorne's partner; Detective Inspector |
| Tom |
Thorne | Detective Inspector; protagonist |
| Christopher |
Tully | One of the victims |
| Jeremy |
Walker | Wood Green Detective Chief Inspector |
| Helen |
Weeks | Thorne's live-in partner |
| Alfie |
| Helen's son |
| Bryony |
| Humanist celebrant |
| ButterflyGrrrl |
| Emily's dark web username |
| Chowdhury |
| Thorne's colleague |
| Diane |
| Mother of LoveMyBro; Martin's wife |
| Fiona |
| Tanner's girlfriend |
| Liam |
| Phil's boyfriend |
| LoveMyBro |
| Computer hacker |
| Martin |
| Father of LoveMyBro |
