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.
The series ran for 23 episodes and has an average IMDb rating of 7.9 stars.
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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?
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