| | | | Part 1 |
| 1 | Anna Louise | Hart | A seasoned missing persons detective. Protagonist. |
| | Clinton | | The current President. |
| 2 | Jeremiah | Price | The boy who was killed by his grandma. |
| | Brendan | Hart | Anna's husband. |
| | Frank | Leary | Anna's supervising officer. |
| 3 | Hap | | A forest ranger. Anna's adoptive father. |
| | Erick | Albertson | The first master of
Mendocino's Masonic order. |
| | Eden | | Hap's wife. Anna's adoptive mother. |
| | Cameron | Curtis | Missing. |
| | Kirk | | The owner of the cottage for rent. |
| 4 | Linda | Stephens | Anna's social worker. |
| 6 | Will | Flood | Anna's childhood friend. A sheriff. |
| | Emily | Hague | An actress. Cameron's adoptive mother. |
| 7 | Caleb | Ford | Will and Anna's childhood friend. |
| | Jenny | Ford | Caleb's twin. Murdered. |
| 8 | Amber | Swartz-Garcia | One of the missing girls. |
| | Beth | Flood | Will's wife. |
| 10 | Ellis | Flood | Will's father. A retired Sheriff. |
| | Jack | Ford | Caleb and Jenny's father. |
| 11 | Corolla | | Anna's therapist. |
| | | | Part 2 |
| 13 | Jason | | Anna's half siblings. |
| | Amy | | Anna's half siblings. |
| | Red | | Anna's biological father. |
| | Phyllis | | Anna's neighbor. |
| | Bernard | | Phyllis's dog. |
| 14 | Polly Hannah | Klaas | Kidnapped. |
| | Eddie | Van Leer | The lead detective with Petaluma PD. |
| | Rod | Fraser | The FBI Special Agent. |
| 15 | Gray | Benson | Cameron's best friend. |
| | Troy | Curtis | Emily's husband. Cameron's adoptive father. |
| | Steve | Gonzales | Cameron's English teacher. |
| 17 | Lydia | Hague | Drew's wife. |
| 18 | Drew | Hague | Emily's brother. |
| 20 | Robin | | Anna's mother. |
| 21 | Anne | Benson | Gray's mother. |
| 22 | Leon | | One of Will's associates. |
| | Shannan | Russo | A missing girl in Gualala. |
| 23 | Wanda | | The barmaid. |
| | Denny | | One of Will's associates. |
| | Tally | Hollander | A psychic. |
| | Karen | Russo | Shannan's mother. |
| 25 | Barresi | | A sergeant in Petaluma PD. |
| | Jaycee | Dugard | Kidnapped. |
| | Eve | Nichols | Polly's mother. |
| | Annie | | Polly's half-sister. |
| 26 | Gilliam | Pelham | Polly's friend. A witness. |
| | Kate | McLean | Polly's friend. A witness. |
| | Marc | Klaas | Polly's father. |
| 27 | Lenore | | Eden's bird. |
| 30 | Leon | Jentz | Will's deputy. |
| | Janice | | Drew's assistant. |
| 32 | Clay | La Forge | The camper that Anna met. |
| 36 | Cricket | | Anna's dog. |
| | Indiana | Silverstein | Troy's former assistant and mistress. |
| 37 | Caitlyn | Muncy | Cameron's best friend. |
| 38 | Carol | Leary | Frank's wife. |
| | | | Part 3 |
| 41 | Lisa Marie | Gilbert | Cameron's real name. |
| | Ruben | Gilbert | Cameron's real father. |
| | Jackie | Gilbert | Cameron's real mother. |
| | Kyle | | Hector's friend. |
| | Hector | Gilbert | The boy that Anna met. Cameron's real brother. |
| | Carl | | Hector's uncle. |
| 47 | Bill | Muncy | Caitlyn's father. |
| | Sam | Hollander | Tally's husband. |
| 49 | Yvonne Lisa | Weber | One of the victims of the Sta. Rosa Hitchhiker killer. |
| | Maureen Louise | Sterling | Yvonne's best friend. |
| 50 | Denny | Rasmussen | The lead investigator in Shannan's case. |
| | Robert | Lisicky | The medical examiner. |
| 53 | Charles | Manson | One of the convicted criminals. |
| | David | Berkowitz | One of the convicted criminals. |
| | Edward | Kemper | One of the convicted criminals. |
| | Jamie | Rivera | Murdered. |
| | | | Part 4 |
| 56 | Jake | Douglas | Sam's twin. |
| | Sam | Douglas | Jake's twin. The boy who accidentally shot his brother. |
| 60 | Cherilynn | Leavitt | Will's secretary. |
| 61 | Stan | Wilkes | The supervisor. |
| 68 | Matthew | | Anna's son. |
| | Sarah | | Anna's daughter. |
| | Joyce | | Anna's neighbor who
accidentally killed Sarah. |
