| George | Alleyn | Roderick Alleyn's father. |
| Helena | Alleyn | Roderick Alleyn's mother. aka: Lady Alleyn. |
| Roderick | Alleyn | The Chief Detective Inspector. aka: Rory. |
| | Anderson | Carawe's acquaintance. |
| Johann S. | Bach | A German composer. |
| | Bailey | One of Alleyn's men. |
| Anthony | Bank | Paddy's greatest friend. |
| Joseph | Birnbaum | A painter. Rose's grandfather. |
| Rose | Birnbaum | Lady Halcut-Hackett's acquaintance. |
| Dr. | Bletherley | A superintendent doctor. |
| Trelawney | Caper | One of Carrado's acquaintances. |
| James | Carewe | A detective constable. |
| Evelyn O'Brien | Carrados | A London socialite. Formerly Evelyn Curtis. aka: Donna. |
| Herbert | Carrados | Evelyn's second husband. aka: Bart. |
| Dr. | Curtis | A surgeon. |
| | Cuthbert | Manager of the club. |
| Daniel | Davidson | A physician to London elite. |
| Charles | Dickens | English writer and social critic. |
| Columbo | Dimitri | A London caterer. |
| Francois | Dupont | Dimitri's personal servant. |
| Albrecht | Durer | German painter, printmaker, mathematician, and theorist. |
| Brer | Fox | A detective inspector. |
| Lord Robert | Gospell | A London aristocrat. Alleyn's friend. aka: Bunchy. |
| Mrs. | Halcut-Hackett | A social-climbing blackmailing victim. |
| Violet | Harris | Evelyn Carrados' secretary. |
| Charles | Kingsley | English clergyman, historian and novelist. |
| Lucy | Lorrimer | An elderly socialite. aka: Lady Lorrimer. |
| Arthur | Marsdon | Evelyn's uncle. |
| Bridget | O'Brien | Paddy and Evelyn's daughter. |
| Paddy | O'Brien | Evelyn Carrados' first husband. |
| Percy | Percival | One of Carrado's acquaintances. |
| Donald | Potter | Lord Robert's nephew. |
| Walter | Scott | Scottish novelist, poet and playwright. |
| Miss | Smith | Miss Harris' friend. aka: Smithy. |
| William R. | Smith | Scottish orientalist and minister of the Free Church of Scotland. |
| | Thompson | A detective sergeant. |
| | Titheridge | A police constable. |
| Agatha | Troy | A famous painter. |
| Paul | Verlaine | A French poet. |
| Humphrey | Ward | English first-class cricketer. |
| Maurice | Withers | Donald Potter's friend. aka: Wits. |
| Canon | Worsely | Miss Harris' old friend. |
| Charlotte M. | Yonge | English writer, editor. |
| Broomfield | | Bunchy's eldest nephew. |
| Edith | | Walter Harris' wife |
| George | | Lady Alleyn's elder son. |
| Grace | | George's wife. |
| Hughie | | A band leader. |
| Mildred | | Lord Robery's sister. |
| Raphael | | Italian painter and architect. |
| Sarah | | George and Grace's daughter. |
| Simmons | | A cloakroom attendant. |
| Sistine Madonna | | An oil painting. |
| Sophie | | Evelyn Carrados' maid. |
| Vassily | | Alleyn's old servant. |
| Walter | | Miss Harris' uncle. |
