| Arthur | Charpentier | Naval officer and son of Madame Charpentier. |
| Madame | Charpentier | Boardinghouse owner. |
| Elder | Drebber | One of the principal Mormon elders. |
| Enoch J. | Drebber | Murder victim. |
| John | Ferrier | A traveler rescued by the Mormons. |
| Lucy | Ferrier | John Ferrier's adopted daughter. |
| Tobias | Gregson | One of the Scotland Yard detectives. |
| Sherlock | Holmes | Consulting detective to the London police force. |
| Jefferson | Hope | Hunter and silver prospector who fell in love with Lucy Ferrier. |
| | Johnston | One of the principal Mormon elders. |
| | Kemball | One of the principal Mormon elders. |
| Mr. | Lestrade | One of the Scotland Yard detectives. |
| | Murray | An orderly who saved Watson at the Battle of Maiwand. |
| John | Rance | The constable who found Drebber's body. |
| Joseph | Smith | American religious leader and founder of Mormonism. |
| | Stamford | Watson's old acquaintance. |
| Elder | Stangerson | One of the principal Mormon elders. |
| Joseph | Stangerson | Drebber's private secretary. |
| John | Underwood | Store owner. |
| John H. | Watson | British army doctor who was injured during the Afghan war. |
| Brigham | Young | Chief of the Mormons. |
| Alice | | Madame Charpentier's daughter. |
| Cowper | | Jefferson Hope's Mormon acquaintance. |
| Wiggins | | Leader of the street urchins employed by Holmes. |
