Conversation so far:
What is Agatha Christie's legacy?
Christie is the world's best-selling mystery writer and is considered a master of suspense, plotting, and characterisation.
What is the name of one of Agatha Christie famous novels?
And Then There Were None is Christie's best-selling novel.
Was Agatha Christie's And Then There Were None a successful novel?
And Then There Were None is Christie's best-selling novel, with 100 million sales to date, making it the world's best-selling mystery ever.

Question: Are there any other interesting aspects about this article?
Self-contained rewrite: Are there any other interesting aspects about this article on Agatha Christie besides her legacy and And Then There Were None novel?