1 | Atlee | Pine | An FBI Special Agent / Protagonist. |
| | | ADX Florence - Only Supermax Prison in the Federal System. |
| Carol | Blum | Atlee Pine's Secretary. |
| J. Edgar | Hoover | A Former FBI Director. |
| Daniel James | Tor | A Big Guy Prisoner / A Serial Killer. |
2 | Mercy | Pine | Atlee Pine's Missing Twin Sister. |
| Henry | Wirz | The Commandant during the Civil War who was executed. |
3 | Colson | Lambert | A National Park Service Ranger / Atlee Pine's Companion. |
| Harry | Rice | A National Park Service Ranger. |
| Mark | Brennan | One of the Mule Wranglers. |
| Benjamin | Priest | The Rider of Sallie Belle / Missing. aka: Ben. |
| Sallie | Belle | The Dead Mule / Deceased. |
| Sam | Kettler | The Mule Ranger on duty when Sallie Belle died. |
4 | Theodore | Roosevelt | The U.S. President. |
| Elizabeth | Colter | The Designer of Phantom Ranch. |
| Ted | Bundy | A Famous Serial Killer. |
5 | Shelby | Foster | A Teenage Traveller who loves mule. |
| Jasmine | | One of the Mule in Grand Canyon. |
7 | Margaret | Mitchell | An Author. |
| Peter | Steuben | The Executive Assistant Director of the FBI. |
| Edward | Priest | Ben Priest's Brother. aka: Ed. |
8 | Mr. | Hoover | Carol Blum's Former Boss. |
| Roger | Avery | Atlee Pine's Superior. |
9 | Jordan | | A Backed Explorer who found a secret cave in Grand Canyon. |
| Kinkaid | | A Backed Explorer who found a secret cave in Grand Canyon. |
10 | Elmer | Lancaster | A Wealthy Man who does layouts of streets and subdivisions. |
| Sunburn | | Joe Yazzie Jr.'s friend. aka: Tim Mallory. |
| Joe | Yazzie Sr. | Atlee Pine's Friend / An Officer on Navajo Station Police. |
| Joe | Yazzie Jr. | Joe Yazzie Sr.'s son. |
| Kyle | Chavez | Joe Yazzie Jr.'s friend / A Troubled Child. |
12 | Kenny | Kuni | A Gym Owner. |
13 | | | ICE - U.S. Immigration and Customs Enforcement. |
| Frank | Stark | An FBI Veteran. |
15 | Jeniffer | Yazzie | Joe Yazzie Sr.'s wife / A Police Sketch Artist. |
| Thomas | Mallory | Sunburn's Brother. |
| Matt | Mallory | Sunburn's Brother. |
| Marjorie | Parks | An Assistant Medical Examiner with the FBI. |
19 | Mary | Priest | Edward Priest's Wife. |
20 | Fred | Harvey | Owner of the Grand Canyon's South Rim. |
| Uncle | Sam | Benjamin Priest's Boss. |
22 | Clint | Dobbs | The Head of FBI in Arizona. |
24 | Maasaw | | The God of Death who lives in the Grand Canyon's Cave. |
26 | Kurt | Ferris | A CID Investigator in the ARMY. |
27 | Melanie | Renfro | Ben Priest's Neighbor. |
| Jeffery | | Melanie Renfro's 2nd Husband. |
| Parker | | Melanie Renfro's 1st Husband. |
31 | | | VPN - Virtual Privacy Network. |
32 | Father | Paul | Companion of Ben Priest. |
33 | Simon | Russell | Owner of a Large Town House / Ben Priest's Friend. |
38 | Oskar | Fabrikant | An American Scholar / Ben Priest's Friend and Workmate. |
| Phillip | | Oskar Fabrikant's Assistant. |
| Sung Nam | Chung | An International Killer. |
40 | Will | Candler | Workmate of Ben Priest. |
41 | David | Roth | A WMD Inspector / A man who took Ben Priest's Place. |
| Herman | Roth | David Roth's Father. |
43 | Scott | | Carol Blum's Ex Husband. |
44 | Billy | Priest | Edward Priest's Son. aka: William. |
| Michael | Priest | Edward Priest's Son. |
45 | Fred | Worsley | Man who has the Nuclear Device / David Roth's Close Friend. |
48 | Debbie | | A Lost Girl that Atlee Pine met at the Train Station. |
| Nancy | | Debbie's Mother. |
| Hermione | | Debbie's Doll. |
61 | Harold | Sykes | The FBI Director / Clint Dobb's Boss. |
| Doug | | An ICE Commander. |
| Vladimir | Putin | The Russian President. |
63 | Walter | Tillman | An FBI Agent who recruited Atlee Pine to a higher position. |