| | | | Part 1 |
| 1 | Walter | Dew | Dr. Crippen's nemesis. |
| | A.H. | Rostron | A Ship Captain. |
| | Charlie | Chaplin | An English comic actor. Lydia's former workmate. |
| | Dr. | Crippen | The doctor who murdered his wife. |
| 2 | Henry | Brown | A music hall performer. |
| | | | Lusitania - A Cunard Liner. |
| | William | Turner | The Lusitania Captain. |
| | Walter | Baranov | The false inspector dew. Protagonist. Aka: Walter Brown, Walter Dew. |
| | George | Little | The Lusitania's third engineer. |
| | Louis | Seize | A dining saloon owner. |
| | Anderson | | A staff captain. |
| | Albert | Bestic | A third officer. |
| | Katherine | Barton | A cabin stewardess. |
| | Alfred | Vanderbilt | The richest passenger on board. |
| | Carl | Frohman | The theater producer. |
| | Delia | Hawkman | A New York Socialite. |
| | Hamilton | | A cabin steward. |
| | Isaac | Lehmann | A New Yorker who went on a lifeboat. |
| | | | Part 2 |
| 1 | Alma | Webster | Baranov's client. Mistress. |
| | Laura | | Alma's aunt. |
| | Mrs. | Maxwell | Alma's manageress. The woman who recommended Baranov to Alma. |
| | Eileen | | Alma's best friend. |
| | Arthur | | Alma's lover. |
| | Ethel | Le Neve | Dr. Crippen's mistress. |
| | Lydia | Baranov | Mr. Baranov's wife. |
| | Poppy | Duke | A brilliant thief. |
| 3 | Sylvia | | Walter and Lydia's housemaid. |
| | Lloyd | George | The Prime Minister of U.K. |
| | Jasper | | A director. |
| | George | | Jasper's barman. |
| | Blanche | | Jasper's companion. |
| 4 | Marjorie | Livingstone-Cordell | Barbara's mother. |
| | Livy | | Marjorie's third husband. Barbara's step-father. Aka: Livingstone. |
| | Barbara | Barlinski | Marjorie's daughter. |
| | Alain | | Marjorie's massage therapist. |
| 7 | Hetty | Kelly | Lydia's friend. |
| 8 | Rose | | Poppy's sister. |
| | Jack | Hamilton | The man who recruited Poppy. Aka: Jack Gordon. |
| | Kate | | Jack's wife. |
| 10 | Bridget | | Walter and Bridget's housemaid. |
| 11 | Paul | Westerfield II | A millionaire's son. Barbara's friend. |
| | Bertrand | Russell | A prominent doctor. |
| 16 | Simon | Edwards | Maggie's brother-in-law. |
| | | | Part Three |
| 2 | Forbes | | A guy that Barbara dated. |
| | Rex | | The guy who flirted with Barbara. |
| 14 | John | Finch | The man that Alma met at the ship. Aka: Johnny Finch. |
| 15 | Katherine | Masters | The woman that Paul and Jack met. A whist player. |
| | | | Part Four |
| 1 | Mrs. | Saxon | The Ship Master-at-Arms. |
| 3 | Wilf | Dutton | The English man that Walter met at the 2nd class dining saloon. |
| | Sally | Dutton | Wilf's daughter. |
| | Jean | Dutton | Wilf's wife. |
| 10 | Bill | Tillden | An American Baseball player. |
| | | | Part Five |
| 4 | Giovanni | Martinelli | The concert chairman. |
| 14 | Mile | Lenglen | A tennis player. |
