She's created two of the most famous detectives of all time - Hercule Poirot and Miss Marple - and even had a mystery of her own when she suddenly disappeared in in 1926, leaving her car abandoned and prompting 15,000 people to search for her over a period of 11 days.
When it comes to the best adaptations to watch, Express.co.uk compared all IMDb ratings to make a definitive list.
"pass the baton on" to her successor, and sadly died in 2015. The series ran for 23 episodes and has an average IMDb rating of 7.9 stars.
" data-has-syndication-rights="1" data-portal-copyright="ITV" data-licensor-name="ITV" />It follows 10 strangers who are lured to an island off the Devon coast and picked off one by one - but who is the mysterious killer?
" data-has-syndication-rights="1" data-portal-copyright="BBC" data-licensor-name="BBC" />
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