What Really Happened is a 1926 crime novel by the British author Marie Belloc Lowndes.

[1] It was published in London by Hutchinson and in New York by Doubleday.

[3] Lowndes based the story on the Bravo Murder Case, shifting the setting from the 1870s to the present day.

[4] In 1963 it was adapted as an episode of the eight series of The Alfred Hitchcock Hour featuring Anne Francis, Ruth Roman and Gladys Cooper.

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