| Harriet |
Alshon | Eugenia Morgan's true identity |
| Earnest |
Bernard | Francis Bernard's father |
| Francis |
Bernard | Inmate convicted of killing Ethan's father |
| Whalen |
Bernard | Francis Bernard's mother |
| Nicholas |
Brann | Portia Vail's fiancé |
| Jimmy |
Buffet | Public figure referenced in the narrative |
| Chip |
Carter | CEO of the hospital where Ethan works |
| Blake |
Cordis | Callie's volleyball coach |
| Ari |
Cutlass | Prison warden |
| Clint |
Dackery | Former chief of the Milwaukee Police Department |
| Jeffrey |
Dahmer | Real-life serial killer referenced in the narrative |
| Geraldine |
Feck | State's attorney |
| Jon |
Grace | DPU agent |
| Ethan |
Hall | Emergency room physician and protagonist. Aka: Dr. Hall |
| Henry |
Hall | Ethan's father, a police detective murdered by Francis Bernard |
| Christine |
Jackson | Chairperson of the Wisconsin Parole Commission |
| Maddie |
Jacobson | Ethan's partner and Milwaukee Police detective |
| Elton |
John | British singer-songwriter |
| Callie |
Jones | Governor's daughter who went missing ten years earlier |
| Jaycee |
Jones | Callie's sister |
| Mark |
Jones | Governor and Callie's father |
| Gayle |
Kirk | Journalist at The New York Times |
| Pete |
Kramer | Special agent from Wisconsin and Ethan's former partner |
| Lindsay |
Larkin | Anonymous client; CEO and owner; Callie's best friend |
| Christian |
Malone | Ethan's patient |
| Christian |
Malone | Ethan's friend |
| Curt |
McGee | Cherryview's athletic director |
| Andre |
Monroe | Head guard at WSPF |
| Eugenia |
Morgan | Woman obsessed with Francis Bernard |
| Craig |
Norton | Low-level prison guard |
| Jacques |
Prescott | Blake Cordis's boss |
| Cheryl |
Stowe | Supervisor at the clinic Callie previously visited |
| Portia |
Vail | Missing woman |
| Hugh |
Winchester | Man killed by Eugenia Morgan |
| Ruth |
Winchester | Hugh Winchester's wife |
| Beth |
| Lindsay Larkin's assistant |
| Damien |
| Callie's stepfather |
| Gracie |
| One of Callie's teammates |
| Kai |
| Elderly woman from the Chippewa tribe |
| Margaret |
| Francis Bernard's sister |
| Molly |
| One of Callie's teammates |
| Ramon |
| Doctor and potential new hire |
| Reddy |
| One of Callie's teammates |
