I gained the impression that, right from the beginning, even though she had "discovered" a very good detective in Hercule Poirot, she was always experimenting and searching for another.
Here are the first ten titles, courtesy of Wikipedia.
Although 5 of the novels featured Hercule Poirot, the experienced, fastidious, though aging Belgian, we can also see that she introduced a couple of "bright young things" in search of a job, a military man, a policeman, and then finally a spinster who was a a bit of a sticky beak.
Ideas of international conspiracies and espionage come high on the list as she plays around with forms of the genre, as does the various legacies of the Great War.
Miss Marple does not seem to have hit the spot, because she doesn't appear again in a novel for another decade.
Here are links to my reviews:
- 1920, THE MYSTERIOUS AFFAIR AT STYLES
- 1922, THE SECRET ADVERSARY
- 1923, THE MURDER ON THE LINKS
- 1924, THE MAN IN THE BROWN SUIT
1924, Poirot Investigates (short stories: eleven in the UK, fourteen in the US)
- 1925, THE SECRET OF CHIMNEYS - Superintendent Battle
- 1926, THE MURDER OF ROGER ACKROYD
- 1927, THE BIG FOUR
- 1928, THE MYSTERY OF THE BLUE TRAIN
- 1929, THE SEVEN DIALS MYSTERY - Superintendent Battle
1929, Partners in Crime (fifteen short stories; featuring Tommy and Tuppence)
- 1930, THE MURDER AT THE VICARAGE
1930, The Mysterious Mr. Quin (twelve short stories; introducing Mr. Harley Quin)
Watch out for my next post about her search for a sleuth.