| Allegra |
Armstrong-Johnson | Mother at Dylan's school |
| Matt |
B. | Florence Grimes's current fling |
| Charlie |
Choi | Max Choi's twin brother |
| Jenny |
Choi | New mother at St. Angeles |
| Max |
Choi | Jenny Choi's son |
| Mr. |
Dempsey | Biology teacher |
| Eliza |
Dobbins | New Head of Pastoral Care |
| Mr. |
Foster | One of Dylan's teachers |
| Detective |
Glover | Detective |
| Brooke |
Grimes | Florence Grimes's sister |
| Florence |
Grimes | Narrator and protagonist |
| Dylan |
Grimes-Palmer | Florence Grimes's son |
| Hope |
Gruber | Florence's nemesis; PTA president |
| Nicola |
Ivy | School head |
| Rupert |
Johnson | Allegra Armstrong-Johnson's husband |
| Dr. |
Lieber | Child psychologist |
| Mr. |
MacGregor | Dylan's coach |
| Mr. |
Papasizi | School caretaker |
| Verity |
Parker | Front office administrator |
| Alfie |
Risby | Missing boy |
| Cleo |
Risby | Alfie Risby's mother; the coolest mom at St. Angeles |
| Ian |
Risby | Rollo Risby's secret son |
| Rollo |
Risby | Cleo Risby's husband |
| Elliott |
Rivera | Florence Grimes's longtime friend; music manager |
| Helen |
Schulz | School's deputy head |
| Robin |
Sexton | Former teacher at St. Angeles |
| Carly |
Simon | American singer-songwriter and musician |
| Detective |
Singh | Glover's partner |
| Bush |
Strangler | Infamous serial killer |
| Karl |
Theodor | Hope Gruber's husband |
| Adam |
| Florence Grimes's close friend |
| Alfonso |
| Lacey's husband |
| Barry |
| Florence Grimes's stepfather |
| Belinda |
| Jenny Choi's nanny |
| Caroline |
| Florence Grimes's client |
| Cecilia |
| Alfie Risby's nanny |
| Davis |
| Police constable |
| Farzanah |
| Dermatologist |
| Greta |
| Dylan Grimes-Palmer's turtle |
| Jess |
| Florence Grimes's former bandmate |
| Julian |
| Brooke Grimes's fiancé |
| Lacey |
| Florence Grimes's former bandmate |
| Linh |
| Nail artist; Florence Grimes's friend |
| Mariah |
| Florence Grimes's best friend |
| Marta |
| Adam's former girlfriend |
| Mary |
| Helen Schulz's sister |
| Pandora |
| Julian's sister |
| Ramon |
| Tilly's husband |
| Ricky |
| Bartender |
| Teddy |
| Hope Gruber's son; Trip's twin brother |
| Thompson |
| Police officer who helped Florence |
| Tilly |
| Brooke Grimes's best friend |
| Trip |
| Hope Gruber's son |
| Will |
| Florence Grimes's former husband |
| Wolfie |
| Allegra Armstrong-Johnson's son |
| Zain |
| Farzanah's gifted son |
