| Pro |
Alfie | Risby |
Missing boy |
| | Dylan |
Grimes-Palmer | Florence Grimes's son |
| | Cecilia |
| Alfie Risby's nanny |
| 1 | Helen |
Schulz | School's deputy head |
| | Mr. |
Foster | One of Dylan's teachers |
| | Florence |
Grimes | Narrator and protagonist |
| 2 | Eliza |
Dobbins | New Head of Pastoral Care |
| | Allegra |
Armstrong-Johnson | Mother at Dylan's school |
| | Hope |
Gruber | Florence's nemesis; PTA president |
| | Rupert |
Johnson | Allegra Armstrong-Johnson's husband |
| | Wolfie |
| Allegra Armstrong-Johnson's son |
| | Carly |
Simon | American singer-songwriter and musician |
| | Will |
| Florence Grimes's former husband |
| 3 | Trip |
| Hope Gruber's son |
| | Teddy |
| Hope Gruber's son; Trip's twin brother |
| | Karl |
Theodor | Hope Gruber's husband |
| | Farzanah |
| Dermatologist |
| | Zain |
| Farzanah's gifted son |
| | Cleo |
Risby | Alfie Risby's mother; the coolest mom at St. Angeles |
| | Jenny |
Choi | New mother at St. Angeles |
| | Max |
Choi | Jenny Choi's son |
| | Charlie |
Choi | Max Choi's twin brother |
| | Dr. |
Lieber | Child psychologist |
| | Greta |
| Dylan Grimes-Palmer's turtle |
| | Elliott |
Rivera | Florence Grimes's longtime friend; music manager |
| | Linh |
| Nail artist; Florence Grimes's friend |
| | Bush |
Strangler | Infamous serial killer |
| 4 | Marta |
| Adam's former girlfriend |
| | Adam |
| Florence Grimes's close friend |
| | Matt |
B. | Florence Grimes's current fling |
| | Caroline |
| Florence Grimes's client |
| | Brooke |
Grimes | Florence Grimes's sister |
| | Lacey |
| Florence Grimes's former bandmate |
| | Jess |
| Florence Grimes's former bandmate |
| | Mariah |
| Florence Grimes's best friend |
| | Alfonso |
| Lacey's husband |
| 5 | Barry |
| Florence Grimes's stepfather |
| | Julian |
| Brooke Grimes's fiancé |
| 7 | Nicola |
Ivy | School head |
| | Mr. |
Dempsey | Biology teacher |
| 8 | Mr. |
MacGregor | Dylan's coach |
| 9 | Rollo |
Risby | Cleo Risby's husband |
| 11 |
Detective | Glover |
Detective |
| | Detective |
Singh | Glover's partner |
| 15 |
Davis | |
Police constable |
| | Thompson |
| Police officer who helped Florence |
| 16 |
Belinda | |
Jenny Choi's nanny |
| 17 |
Mr. | Papasizi |
School caretaker |
| | Mary |
| Helen Schulz's sister |
| 21 |
Pandora | |
Julian's sister |
| | Tilly |
| Brooke Grimes's best friend |
| | Ramon |
| Tilly's husband |
| | Ian |
Risby | Rollo Risby's secret son |
| 24 |
Robin | Sexton |
Former teacher at St. Angeles |
| 32 |
Verity | Parker |
Front office administrator |
| | Ricky |
| Bartender |
