| Description | Character | appears in . . . |
| A moustached Belgian | |
| A chilvalrous Watson-esque character | |
| Secretary to the Belgian detective | |
| Police Inspector | |
| Mystery novelist | |
| Ex-army Colonel and ex-chief of MI5 | |
| An bright old lady of St. Mary Mead | |
| Novelist, nephew of our intelligent spinster | |
| Chief constable of police and retired colonel | |
| Policeman in the area of St. Mary Mead | |
| Inhabitant of St. Mary Mead | |
| Inhabitant of St. Mary Mead | |