| 1 | Gideon | Fell | Doctor of philosophy, expert on crime. Protagonist. |
| | Tad | Rampole | An American college graduate. Prof. Melson's student. |
| | Bob | Melson | Fell's friend. |
| | Edgar | Wallace | An author. |
| | Mr | Payne | Chatteram's legal adviser. |
| | Martin | Starbeth | Dorothy's brother. Governor of Chatteram. |
| 2 | Dorothy | Starbeth | Mr. Starbeth's sister. The woman Tad falls in love with. |
| 3 | Mrs. | Fell | Fell's wife. |
| | Tom | Nash | An author. |
| | George | Gascoigne | An author. |
| | Timothy | Starbeth | Martin and Dorothy's father. |
| | Jenkins | | One of Timothy's tenants. |
| | Dr | Markley | The coroner. |
| | Thomas Audley | Saunders | The rector. |
| | Herbert | Starbeth | Martin and Dorothy's cousin. |
| | Anthony | Starbeth | Martin's ancestor. |
| | John | Howard | The man that started an agitation for detention prisons. |
| 4 | Mrs. | Granby | One of the girls who used the Ouija board. |
| | Leutitia | Markley | One of the girls who used the Ouija board. |
| | Miss | Portenson | One of Dorothy's neighbors. |
| | Wilfrid | Denim | One of Dorothy's neighbors. |
| | Norman | Thomas | An American Minister. |
| | Theodosia | Payne | The lawyer's wife. |
| 5 | John | Hepditch | One of the prisoners who was hanged. |
| | Lewis | Martens | One of the prisoners who was hanged. |
| 6 | Mr. | Budge | The Starbeth's butler. |
| | Martha | Bundle | The Starbeth's housekeeper. |
| | Mrs. | Tampon | The chemist's wife. |
| 7 | Benjamin | Arnold | The chief constable. |
| 8 | Sweeney | Todd | The demon barber of Fleet Street. |
| 10 | Annie | Murphy | One of the housemaids. |
| 15 | Mr. | Rankin | Mr. Budge's friend. Mr. Payne's butler. |
| | Mrs. | Rankin | Mr. Payne's housekeeper. |
| 16 | Wlliam | Rossiter | The high commissioner at the yard. |
| 17 | Robert | Saunders | Thomas's uncle. |
| | Jennings | | The police inspector. |
