| Ellen |
Besner | Principal of the school Avery attended. |
| Nora |
Blanchard | William's mistress; married to Al Blanchard. |
| Al |
Blanchard | Nora's husband. |
| Ryan |
Blanchard | Nora and Al's son. |
| Faith |
Blanchard | Nora and Al's daughter. |
| Detective |
Bledsoe | Lead detective investigating Avery's disappearance. |
| Ms. |
Burke | Avery's music teacher. |
| Marion |
Cooke | Nurse who works with Nora. |
| Oliver |
Fuller | Criminal attorney. |
| Detective |
Gully | Detective Bledsoe's partner. |
| Officer |
Hollis | Police officer who responds to Erin's report of Avery's disappearance. |
| Officer |
Rosales | Hollis's partner. |
| Jenna |
Seton | Avery's friend. |
| Alice |
Seton | Jenna's mother. |
| Pete |
Seton | Jenna's brother. |
| Derek |
Seton | Jenna's brother. |
| Samantha |
Slagle | Faith Blanchard's friend. |
| Mrs. |
Slagle | Samantha's mother. |
| Dr. |
Vezna | William's colleague at the hospital. |
| Officer |
Weeks | Police officer assisting in the investigation. |
| Adam |
Winter | Lonely boy who lives down the street; becomes a key figure in the case. |
| Gwen |
Winter | Adam's mother. |
| Casey |
Wong | Prominent television journalist who interviews Avery. |
| William |
Wooler | Avery's father; doctor; involved in an affair with Nora. |
| Erin |
Wooler | William's wife; Avery's mother. |
| Avery |
Wooler | William and Erin's daughter; goes missing. |
| Michael |
Wooler | Avery's brother. |
| Mark |
| Adam's father; Gwen's ex-husband. |
| Katie |
| Daughter of one of the police officers. |
