| Erick | Albertson | The first master of Mendocino's Masonic order. |
| Anne | Benson | Gray's mother. |
| Gray | Benson | Cameron's best friend. |
| David | Berkowitz | One of the convicted criminals. |
| Cameron | Curtis | Missing. |
| Troy | Curtis | Emily's husband. Cameron's adoptive father. |
| Jake | Douglas | Sam's twin. |
| Sam | Douglas | Jake's twin. The boy who accidentally shot his brother. |
| Jaycee | Dugard | Kidnapped. |
| Beth | Flood | Will's wife. |
| Ellis | Flood | Will's father. A retired Sheriff. |
| Will | Flood | Anna's childhood friend. A sheriff. |
| Caleb | Ford | Will and Anna's childhood friend. |
| Jack | Ford | Caleb and Jenny's father. |
| Jenny | Ford | Caleb's twin. Murdered. |
| Rod | Fraser | The FBI Special Agent. |
| Hector | Gilbert | The boy that Anna met. Cameron's real brother. |
| Jackie | Gilbert | Cameron's real mother. |
| Lisa Marie | Gilbert | Cameron's real name. |
| Ruben | Gilbert | Cameron's real father. |
| Steve | Gonzales | Cameron's English teacher. |
| Drew | Hague | Emily's brother. |
| Emily | Hague | An actress. Cameron's adoptive mother. |
| Lydia | Hague | Drew's wife. |
| Anna Louise | Hart | A seasoned missing persons detective. Protagonist. |
| Brendan | Hart | Anna's husband. |
| Sam | Hollander | Tally's husband. |
| Tally | Hollander | A psychic. |
| Leon | Jentz | Will's deputy. |
| Edward | Kemper | One of the convicted criminals. |
| Marc | Klaas | Polly's father. |
| Polly Hannah | Klaas | Kidnapped. |
| Clay | La Forge | The camper that Anna met. |
| Carol | Leary | Frank's wife. |
| Frank | Leary | Anna's supervising officer. |
| Cherilynn | Leavitt | Will's secretary. |
| Robert | Lisicky | The medical examiner. |
| Charles | Manson | One of the convicted criminals. |
| Kate | McLean | Polly's friend. A witness. |
| Bill | Muncy | Caitlyn's father. |
| Caitlyn | Muncy | Cameron's best friend. |
| Eve | Nichols | Polly's mother. |
| Gilliam | Pelham | Polly's friend. A witness. |
| Jeremiah | Price | The boy who was killed by his grandma. |
| Denny | Rasmussen | The lead investigator in Shannan's case. |
| Jamie | Rivera | Murdered. |
| Karen | Russo | Shannan's mother. |
| Shannan | Russo | A missing girl in Gualala. |
| Indiana | Silverstein | Troy's former assistant and mistress. |
| Linda | Stephens | Anna's social worker. |
| Maureen Louise | Sterling | Yvonne's best friend. |
| Amber | Swartz-Garcia | One of the missing girls. |
| Eddie | Van Leer | The lead detective with Petaluma PD. |
| Yvonne Lisa | Weber | One of the victims of the Sta. Rosa Hitchhiker killer. |
| Stan | Wilkes | The supervisor. |
| Amy | | Anna's half siblings. |
| Annie | | Polly's half-sister. |
| Barresi | | A sergeant in Petaluma PD. |
| Bernard | | Phyllis's dog. |
| Carl | | Hector's uncle. |
| Clinton | | The current President. |
| Corolla | | Anna's therapist. |
| Cricket | | Anna's dog. |
| Denny | | One of Will's associates. |
| Eden | | Hap's wife. Anna's adoptive mother. |
| Hap | | A forest ranger. Anna's adoptive father. |
| Janice | | Drew's assistant. |
| Jason | | Anna's half siblings. |
| Joyce | | Anna's neighbor who accidentally killed Sarah. |
| Kirk | | The owner of the cottage for rent. |
| Kyle | | Hector's friend. |
| Lenore | | Eden's bird. |
| Leon | | One of Will's associates. |
| Matthew | | Anna's son. |
| Phyllis | | Anna's neighbor. |
| Red | | Anna's biological father. |
| Robin | | Anna's mother. |
| Sarah | | Anna's daughter. |
| Wanda | | The barmaid. |
