| Officer |
Brook | Detective Inspector |
| Beatrice |
Brown | Colin's mother |
| Colin |
Brown | Summer's captor. Aka: Clover |
| Harold |
Dane | Summer's neighbor |
| Vin |
Diesel | Actor |
| Gregory |
Hart | Colin's colleague; senior lawyer. Aka: Greg |
| Natalie |
Hart | Greg's wife |
| Mrs. |
Hellmann | The woman who went missing |
| Mrs. |
Koop | The florist |
| Officer |
McKinney | Officer Brook's partner |
| Jessica |
Paterson | HR staff at Colin's workplace |
| Daniel |
Robinson | Summer's father |
| Dawn |
Robinson | Summer's mother |
| Henry |
Robinson | Summer's brother |
| Summer |
Robinson | Narrator and protagonist |
| Channing |
Tatum | Actor |
| Michael |
Walsh | Detective in charge of Summer's case |
| Bree |
| One of the first set of girls Clover kidnapped |
| Brian |
| Lisa's husband |
| Cantrell |
| Prostitute |
| Catherine |
| Clover's first victim |
| Christy |
| Receptionist at Colin's workplace |
| Dan |
| One of Colin's groupmates searching for Summer |
| Emma |
| Lewis's mother |
| Ethan |
| Kerri's boyfriend |
| Jack |
| Rachel's on-and-off boyfriend |
| Jane |
| HR staff at Colin's workplace |
| Jemma |
| Colin's assistant |
| Kate |
| One of Colin's groupmates searching for Summer |
| Kerri |
| Summer's friend |
| Layal |
| One of Colin's victims |
| Lewis |
| Summer's boyfriend |
| Lily |
| One of the kidnapped girls |
| Lily |
| One of the first set of girls Clover kidnapped |
| Lisa |
| Lewis's aunt |
| Miranda |
| Jessica's colleague |
| Poppy |
| One of the kidnapped girls. Aka: Rebecca |
| Rachel |
| Summer's friend |
| Rick |
| One of Colin's groupmates searching for Summer |
| Sadie |
| One of the first set of girls Clover kidnapped |
| Shannen |
| One of the kidnapped girls. Aka: Rose |
| Shannen |
| The girl Colin was obsessed with |
| Tara |
| Summer's nurse |
| Theo |
| Lewis's brother |
| Usher |
| Summer's childhood crush |
| Violet |
| One of the kidnapped girls. Aka: Jennifer |
