| | | | Part One |
| 1 | | | The Manuscript October 12, 1912 |
| | Thomas | Clifford | 1st Baron Clifford of Chudleigh. |
| | Nan | Watts | Agatha Miller's dear friend. |
| | Irving | Berlin | American composer. |
| | Reggie | Lucy | Agatha Miller's
fiancé. |
| 2 | | | Day One After The Disappearance Saturday, December 4, 1926 |
| | Sam | James | Archie's friend. |
| | Madge | James | Sam's wife. |
| | Archibald | Christie | Aviator in Britain. aka: Archie. |
| | Nancy | Neele | Madge James' friend. |
| | Charlotte | Fisher | Christie family's governess and secretary. |
| | Constable | Roberts | A police officer. |
| 3 | | | The Manuscript October 12, 1912 |
| | Arthur | Griffiths | An Irish writer, newspaper editor and politician. |
| | Agatha | Miller | A writer. |
| 5 | | | The Manuscript October 19, 1912 |
| | Max | Mellor | Agatha's friend. |
| | Monty | | One of Agatha's siblings. |
| | Margaret | Miller | One of Agatha's siblings. |
| | Jane | | A housemaid. |
| | Mary | | A cook. |
| | Charles | Furster | A pianist. |
| | William | Hemsley | A schoolmaster from Clinton College. Archie's stepfather. |
| 6 | | | Day One After The Disappearance Saturday, December 4, 1926 |
| | | Kenward | The chief constable. |
| | Rosalind | | Archie and Agatha's daughter. |
| 7 | | | The Manuscript November 19, 1912 |
| | James | | Madge Miller's son. aka: Jack. |
| | James | Watts | Madge Miller's husband. aka: Jimmy. |
| | Arthur Conan | Doyle | Scottish physician and author. |
| | Anna Katharine | Green | American poet and novelist. |
| | Gaston | Leroux | French journalist and author of detective fiction. |
| 9 | | | The Manuscript December 31, 1912 |
| | Wilfred | Pirie | One of Agatha's suitors. |
| | Bolton | Fletcher | One of Agatha's suitors. |
| 11 | | | The Manuscript January 1913 - November 1914 |
| | Peg | Hemsley | Archie's mother. |
| | Marne | | One of the wounded soldiers. |
| | Antwerp | | One of the wounded soldiers. |
| 12 | | | Day One After The Disappearance Saturday, December 4, 1926 |
| | King John | | The youngest son of King Henry II of England. |
| 13 | | | The Manuscript December 23-24, 1914 |
| | Auntie-Granni | | Agatha's grandmother. |
| | Yvonne | Bush | Agatha's old friend. |
| | Agatha | Christie | The married name of Agatha Miller. |
| 15 | | | The Manuscript October 14, 1916 |
| | Granny-B | | Auntie-Grannies' younger sister. |
| | Eileen | Morris | Agatha's old friend. |
| | Lucy | | Jane's replacement as maid. |
| 16 | | | Day Two After the Disappearance Sunday, December 5, 1926 |
| | Lilly | | A housemaid. |
| | Charles | Goddard | The head of the Berkshire Constabulary. |
| 17 | | | The Manuscript October 18, 1916 |
| | Arthur | Hastings | A soldier. |
| | Hercule | Poirot | A Belgian refugee. |
| 18 | | | Day Three After The Disappearance Monday, December 6, 1926 |
| | Campbell | Christie | Archie's brother. |
| 19 | | | The Manuscript February 2, 1919 |
| | Mrs. | Woods | The building's caretaker. |
| 20 | | | Day Three After The Disappearance Monday, December 6, 1926 |
| | William | Perkins | Archie's solicitor. |
| | Commander | Reynolds | Scotland Yard's commander. |
| 21 | | | The Manuscript August 1, 1919 - January 1920 |
| | | Pemberton | A nurse. |
| | Jessie | Swannel | Rosalind's nanny. |
| | John | Lane | American writer and historian. |
| 24 | | | Day Four After The Disappearance Tuesday, December 7, 1926 |
| | Jim | Barnes | A reporter. |
| | Ralph | Brown | An English writer. |
| | Mrs. | Kitchings | An employee of Little London. |
| | Mr. | Fuett | A railway porter. |
| 25 | | | The Manuscript February 15, 1922 |
| | Mrs. | Hiam | Mrs. Belcher's closest friend. |
| | Major | Belcher | The assistant general manager of the 1924 Empire Exhibition. |
| | Mrs. | Belcher | Major Belcher's wife. |
| 26 | | | Day Five After The Disappearance Wednesday, Dec. 8, 1926 |
| | Sebastian | Earl | Archie's co-worker. |
| | Clive | Baillieu | Archie's boss. |
| 27 | | | The Manuscript May 20, 1923 |
| | Mr. | Bates | Major Belcher's secretary. |
| | Anne | Beddingfeld | A woman who makes sacrifices for the man she loves. |
| | Cuckoo | | Rosalind's new nurse. |
| | Edmund | Cork | One of Agatha Christie's literary agents. |
| 35 | | | The Manuscript August 3-5, 1926 |
| | Peter | | Agatha's dog. |
| 36 | | | Day Eight After The Disappearance Saturday, December ii, 1926 |
| | William J. | Hicks | A solicitor. |
| | Stevens | | A young policeman. |
| | Horace | Leaf | A psychic. |
| 40 | | | Day Eight After The Disappearance Dec.11 through Dec.12, 1926 |
| | Dorothy | Sayers | English crime writer and poet. |
| | Robert | | The son of Archie's gardener. |
| 42 | | | Day Ten After The Disappearance Monday, Dexxcember 13, 1926 |
| | Theseus | | The mythical king and founder-hero of Athens. |
| | Adriadne | | A Cretan princess in Greek mythology. |
| | King Minos | | The King of Crete. |
| | | | Part Two |
| 44 | | | Tuesday, December 14, 1926 |
| | Mrs. | Robson | One of Agatha's acquaintances. |
| | Mr. | Wollesley | One of Agatha's acquaintances. |
| | Rose | | A waitress. |
| 45 | | | Tuesday, December 14, 1926 |
| | Mrs. | Neele | The name used by Agatha while staying at Harrogate Hydro. |
