Conversation so far:
What were some of Agatha Christie's first novels?
The Mysterious Affair.
Was this book successful?
CANNOTANSWER.
What is Poirot?
a former Belgian police officer noted for his twirly large "magnificent moustaches" and egg-shaped head.
Was Poirot a character in one of her books?
The Mysterious Affair at Styles.
What is another of her first novels?
The Secret Adversary (1922).
Was it a best seller?
CANNOTANSWER.
Was any of her early novels critized negatively?
Agatha began working on The Mysterious Affair at Styles in 1916, writing most of it on Dartmoor.
Her original manuscript was rejected by such publishing companies.

Question: Were any others rejected?
Self-contained rewrite: Other than the Mysterious Affair, ere any other Agatha Christie's novels rejected by publishers?