Her first novel, The Mysterious Affair at Styles, introduced
Hercule Poirot the Belgian detective, who appears in a good
number of Christie's novels. Hercule "died" in Curtain, one
year before his creator, in 1975. The other principal
detective, Ms. Jane Marple, an elderly spinster, first
appeared in Murder at the Vicarage, in 1930.
Secret Adversary is her second novel.
Agatha wrote also six novels under the pseudonym of Mary
Westmacott, two memoirs - one of which recounts her
experiences in Syria with her second husband- and an
autobiography that was published after her death.
So many of her books were turned into theatre plays, that
she eventually decided to try by herself. The Mousetrap
(1952), is the longest running play in history with the
record of 8862 performances at one single theater.
Agatha was granted the title of Dame Commander of the
British Empire in 1971. Five years later, when she died,
Agatha was, and still remains to this day, the most
successful murder mystery writer in the world.