Write Yes or No (1) 1. Agatba Christie wrote 6 detective novels and 66 romantic novels during her lifetime. [1] 2. She was an English writer [1] 3. Her famous characters are the British detectives Hercule Poirot and Miss Marple. 4. During her writing career Agatha Christie sold above two billion books. [1] 5. Her best selling story was Murder on the Orient Express.