| Hank |
Bremmer | Police officer with a K9 |
| Susan |
Cleeve | Alice's former best friend |
| Brittany |
Clement | Mysterious woman in true crime group |
| Deep |
Diver | True crime member with information on the case |
| Kate |
Dixon | Paige's attorney |
| Chantelle |
Dubois | Posted complete bio for Sam and Bryden |
| Jonathan |
Fell | Head of forensic investigation |
| Michael |
Fraser | Jayne's boyfriend |
| Bryden |
Frost | Protagonist. |
| Clara |
Frost | Bryden's daughter |
| Sam |
Frost | Bryden's husband |
| Ginny |
Furness | Forensic pathologist |
| Derek |
Gardner | Name on Bryden's contacts, works in cybersecurity |
| Alice |
Gardner | Derek's wife |
| Michelle |
Gautier | Lizzie's online friend in true crime group |
| Karen |
Hennin | Alice's name in the true crime group |
| Lizzie |
Houser | Bryden's sister |
| Donna |
Houser | Sam's mother-in-law |
| Jim |
Houser | Sam's father-in-law |
| Tracy |
Kemp | Angela's former friend and neighbor |
| Henry |
Kemp | Tracy's husband, formerly convicted |
| Lisa |
Kenney | Francine's friend, lives in Bryden's building |
| Tom |
Kilgour | Detective, Jayne's colleague |
| Elisa |
Lam | Missing |
| Francine |
Logan | Witness |
| Luka |
Magnotta | Montreal killer |
| Paige |
Mason | Bryden's best friend |
| Kayly |
Medoff | Woman who accused Henry of rape |
| Gino |
Morelli | Food truck owner |
| Joe |
Pagett | Derek's attorney |
| Emma |
Porter | Lizzie's name in the true crime group |
| Savanah |
Romano | Angela's daughter |
| Angela |
Romano | Bryden's close friend |
| Ravi |
Sabharwal | Building manager |
| Jayne |
Salter | Albany police detective |
| Bonnie |
Sheppard | Bryden's doctor |
| Mary |
Smelt | Murdered, Alice's mother |
| Laura |
Szabo | Sam's attorney |
| Tessa |
Workman | Lizzie's online friend in true crime group |
| Brutus |
| Bremmer's dog |
| Connie |
| Sam's colleague |
| Gwen |
| Dandylion's director |
| Hernandez |
| Police officer |
| Hilda |
| Clara's childcare worker |
| Martin |
| Police officer |
| Rich |
| Alice's former lover |