| Pro | Lord | Selchester | Lord of Selchester Castle. Deceased. |
| | Inspector | MacLeod | Leader of Selchester search party. Aka: Superintendent Macleod. |
| | Lord Tom | Arlingham | Lord Selchester's son. Killed in Palestine. Aka: firecracker. |
| | Lady Sonia | Richmond | Lord Selchester's daughter. |
| | Freya | Wryton | Lord Selchester's neice. |
| | Charles | Guthrie | Foreign Office official. |
| | Lionel | Tallis | Society photographer. |
| | Vivian | Witt | Well known actress. |
| | Stanley | Dillon | Local businessman. |
| 1 | Hugo | Hawksworth | Leg injured in service. A government employee. |
| | Georgia | Hawksworth | Hugo's younger sister. |
| | | | Portcullis - strong sliding grate to block gateway to fortress. |
| | Sir | Bernard | Castle administrator and government employee. |
| | Ben | | Selchester Castle employee. |
| | Mr. | Bunbury | Postman. |
| | Mrs. | Partridge | Housekeeper. |
| 2 | Valerie | | Hugo's female friend. |
| | Aunt | Claire | Georgia's aunt. |
| 3 | Bill | Dringley | Plumber. |
| | John | Brodrick | Bill's helper. |
| | Lady Priscilla | Veryan | Freya's aunt. Lord Selchester's sister. |
| | Mr. | Gusby | Sexton at St. Michael's. |
| | Richard | | The chef at the Castle. |
| 4 | Mrs. | Wandsworth | Shopper. |
| | Mr. | Graham | Shopkeeper. |
| | Dinah | Linthrop | Lives in town of Selchester. Bookstore owner. |
| | Martha | Radley | Shopper. |
| | Marcel | | Beauty salon employee. |
| | Mrs. | Raymond | Lives in town of Selchester. |
| | Leo | Hawksworth | Hugo's uncle. |
| | Hermione | Selchester | Lord Selchester's wife. Moved to Canada. |
| | Sir | Archibald | Lady Priscilla's uncle. |
| | Helena | Archibald | Sir Archibald's wife. |
| | Mabel | | Telephone switchboard operator. |
| 5 | Jamie | | Store proprieter. |
| | Richard | | Store proprieter. |
| | | Burgess | British traitor. |
| | | Maclean | British traitor. |
| | Leo | Hawksworth | Hugo's uncle. A priest. |
| 6 | Daisy | Dillon | Georgia's friend from school. Stanley Dillon's daughter. |
| 7 | Mr. Caleb | Plinth | Freya's uncle's brother. |
| 8 | Mrs. | Tempest | Sir Barnard's secretary. |
| | Mr. | Dorsitt | Government employee. |
| 9 | Dr. | Rogers | Hugo's doctor. |
| | Mrs. | Svensson | Swedish masseuse. |
| | Mrs. | Hardwick | Selchester Castle housekeeper. |
| | Hattie | | Selchester Castle maid. |
| 12 | Edmund | Wryton | Freya's father. |
| 13 | Penny | Dunlap | Georgia's classmate. |
| 14 | Edwin | Coulson | Hugo's surgeon in Berlin. |
| | Henry | Surcoat | Hugo's friend from the "service". |
| 17 | Jason | Filbert | Found dead. |
| 18 | Mr. | Godney | Station-master. |
| 19 | Mrs. | Svensson | Town person. |
| | Rupert | Olivier | With auctioneer company. |
| 20 | Joe | Fibbins | Car garage owner and farm equipment sales. |
| | Brian | | Car garage employee. |
| 21 | Nicholas | Lantern | Member of Parliament. In photograph. |
| | John | Jones | In photograph. |
| | Arseny | Kravtsov | In photograph. |
| | Andrew | Painswick | In the Foreign Office. |
| 22 | Bobby | Sackbut | Young man. Known as "bad boy". |
| | Sir Alistair | Mackkenzie | Financier. |
| 25 | Mrs. | Clutton | Hugo's assistant. |
| | Mr. | Forsyth | The saddler. |
