| 1 | Tanya |
| Autumn's interviewer. |
| | Autumn |
Sanderson | The protagonist. Aka: Number Four, Lark |
| | Denise |
| One of the job applicants. |
| | Paul |
| One of the job applicants. |
| | Evie |
| One of the job applicants. |
| | James |
| One of the job applicants. |
| | Starla |
| One of the job applicants. |
| 2 | Mr. |
X | The mysterious employer. Aka: Mr. X |
| 3 | Betsy |
| The nurse living next door. |
| 4 | George |
| Autumn's driver. |
| | Elijah |
| Mr. X's right-hand man. |
| 5 | Caleb |
| Autumn's colleague, a former IT employee. Aka: Francisco |
| | Vanessa |
| Autumn's colleague. |
| | Lincoln |
| Autumn's colleague, a former psychologist. |
| | Victor |
| Autumn's colleague, a private investigator. |
| | Claire |
| Autumn's colleague, a former nurse. |
| | Sue |
| Mr. X's chef. |
| | Maureen |
| Mr. X's housekeeper. |
| 29 |
Hannah | Vega |
Claire's real identity, company owner. |
| | Luis |
Vega | The real Mr. X, Hannah's husband. |
| | Emilia |
Vega | Hannah and Luis's daughter. |
| 30 |
Lila | |
A longtime guest. |
| | Gloria |
| One of Autumn's colleagues. |
| | Jean |
| A girl Autumn helped. |
| | Soph |
| One of Autumn's colleagues. |
| | Doreen |
| One of Autumn's colleagues. |
| | Elizabeth |
| One of Autumn's colleagues. |