Do you like mystery novels like Agatha Christie's?
oh I love mystery novels but I don't know much about those
She wrote over sixty detective novels. She was extremely popular in earlier generations. 
what was so good about them compared to other stuff at the time?
People just liked the mysteries in her books, I believe, and trying to figure it out. Hercule Poirot was most of the most famous characters of the time. 
oh cool. any movies based on her books?
Agatha Christie's Poirot
Poirot (also known as Agatha Christie's Poirot) is a British mystery drama television series that aired on ITV from 8 January 1989 to 13 November 2013. David Suchet stars as the eponymous detective, Agatha Christie's fictional Hercule Poirot. Initially produced by LWT, the series was later produced by ITV Studios. The series also aired on VisionTV in Canada and on PBS and A&E in the United States.
The programme ran for 13 series and 70 episodes in total; each episode was adapted from
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