| Lydia | Baranov | Mr. Baranov's wife. |
| Walter | Baranov | The false inspector dew. Protagonist. Aka: Walter Brown, Walter Dew. |
| Barbara | Barlinski | Marjorie's daughter. |
| Katherine | Barton | A cabin stewardess. |
| Albert | Bestic | A third officer. |
| Henry | Brown | A music hall performer. |
| Charlie | Chaplin | An English comic actor. Lydia's former workmate. |
| Dr. | Crippen | The doctor who murdered his wife. |
| Walter | Dew | Dr. Crippen's nemesis. |
| Poppy | Duke | A brilliant thief. |
| Jean | Dutton | Wilf's wife. |
| Sally | Dutton | Wilf's daughter. |
| Wilf | Dutton | The English man that Walter met at the 2nd class dining saloon. |
| Simon | Edwards | Maggie's brother-in-law. |
| John | Finch | The man that Alma met at the ship. Aka: Johnny Finch. |
| Carl | Frohman | The theater producer. |
| Lloyd | George | The Prime Minister of U.K. |
| Jack | Hamilton | The man who recruited Poppy. Aka: Jack Gordon. |
| Delia | Hawkman | A New York Socialite. |
| Hetty | Kelly | Lydia's friend. |
| Ethel | Le Neve | Dr. Crippen's mistress. |
| Isaac | Lehmann | A New Yorker who went on a lifeboat. |
| Mile | Lenglen | A tennis player. |
| George | Little | The Lusitania's third engineer. |
| Marjorie | Livingstone-Cordell | Barbara's mother. |
| Giovanni | Martinelli | The concert chairman. |
| Katherine | Masters | The woman that Paul and Jack met. A whist player. |
| Mrs. | Maxwell | Alma's manageress. The woman who recommended Baranov to Alma. |
| A.H. | Rostron | A Ship Captain. |
| Bertrand | Russell | A prominent doctor. |
| Mrs. | Saxon | The Ship Master-at-Arms. |
| Louis | Seize | A dining saloon owner. |
| Bill | Tillden | An American Baseball player. |
| William | Turner | The Lusitania Captain. |
| Alfred | Vanderbilt | The richest passenger on board. |
| Alma | Webster | Baranov's client. Mistress. |
| Paul | Westerfield II | A millionaire's son. Barbara's friend. |
| Alain | | Marjorie's massage therapist. |
| Anderson | | A staff captain. |
| Arthur | | Alma's lover. |
| Blanche | | Jasper's companion. |
| Bridget | | Walter and Bridget's housemaid. |
| Eileen | | Alma's best friend. |
| Forbes | | A guy that Barbara dated. |
| George | | Jasper's barman. |
| Hamilton | | A cabin steward. |
| Jasper | | A director. |
| Kate | | Jack's wife. |
| Laura | | Alma's aunt. |
| Livy | | Marjorie's third husband. Barbara's step-father. Aka: Livingstone. |
| Rex | | The guy who flirted with Barbara. |
| Rose | | Poppy's sister. |
| Sylvia | | Walter and Lydia's housemaid. |
