Agatha and the Truth of Murder

Agatha and the Truth of Murder is a 2018 British alternative history drama. Written by Tom Dalton and directed by Terry Loane. The film mixes the real events revolving around the disappearance of Agatha Christie in 1926, as well as the murder of nurse Florence Nightingale Shore in 1920.

The film's closing credits starts with an announcement:
 * ”This film has not been endorsed, licensed or authorised by the estate of Agatha Christie or by Agatha Christie Limited.”

Plot summary
In 1920 nurse Florence Nightingale Shore (the goddaughter of her more famous namesake) is bludgeoned to death on a train. The murderer was never caught. Six years late novelist Agatha Christie is visited by a friend of the victim, who urges the author to solve the crime.

To solve the crime, Agatha has to disappear from the publics view and go undercover.

Closing credits in alphabetical order

 * Dean Andrews as Wade
 * Ruth Bradley as Agatha Christie
 * Bebe Cave as Daphne
 * Amelia Rose Dell as Rosalind
 * Richard Doubleday as Postmaster Wilson
 * Derek Halligan as Mr. Todd
 * Blake Harrison as Travis Pickford
 * Pippa Haywood as Mabel Rogers
 * Stacha Hicks as Florence Nightingale Shore
 * Ralph Ineson as Detective Inspector Dicks
 * Brian McCardie as Sir Hugh Persimmion
 * Michael McElhatton as Sir Arthur Conan Doyle
 * Tim McInnerny as Randolph
 * Clare McMahon as Carlo
 * Liam McMahon as Archie
 * Seamus O'Hara as PC Spencer
 * Luke Pierre as Zaki Hanachi
 * Joshua Silver as Franklin
 * Samantha Spiro as Pamela

References and allusions
(lengthy - click on expand to read)

References to actual history, geography, and current science
The real murder of Florence Nightingale Shore took place on a train, as depicted in the film.