Murder on the Orient Express was a novel written by Agatha Christie. Christie was inadvertently inspired to write the novel by Donna Noble, who met the writer in 1926 and was not aware that it had not been written yet. Although Christie's conscious memories of her adventure with the Tenth Doctor and Donna were lost, the idea remained as a subconscious influence. (TV: The Unicorn and the Wasp)

In 2986, Sarah Lasky read it in the lounge of the starliner Hyperion III. (TV: Terror of the Vervoids)

The Eleventh Doctor considered Murder on the Orient Express to be a very informative title. (COMIC: The Sound of Our Voices)

Behind the scenes Edit