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.

Question: Was this a successful novel?
Self-contained rewrite: Was Agatha Christie's And Then There Were None a successful novel?